346 lines
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346 lines
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<body>
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<header class="masthead">
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<div class="kicker">Akira Robinson · Field Manual No. 2</div>
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<h1>The Two-Minute Listen</h1>
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<div class="sub">Reading a rodent room by ear before you ever lay a hand on a cage</div>
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<div class="byline">laboratory animal caretaker & veterinary assistant · Decatur, GA</div>
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</header>
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<p class="lede">
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Every morning, before the first cage opens, I stand at the end of the room and
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just <em>listen</em> for two minutes. Not at the animals — at the room. Because a
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sick rodent tells on itself with its breathing before it ever shows you a hunched
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back or a dull eye. The trick is learning which sounds are the room doing its job
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and which sounds are a verdict you've been too busy to hear.
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</p>
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<div class="figure">
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<img src="https://images.pexels.com/photos/15831827/pexels-photo-15831827.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
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alt="Patient, careful listening the way rounds should begin — the room first, the cages second." loading="lazy">
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<figcaption>FIG. 1 — The discipline is the same as the clinic: read quiet, then read signs.</figcaption>
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</div>
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<h2><span class="num">I.</span>Know the baseline before you listen for the trouble</h2>
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<p>
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You can't hear an alarm until you know the hum. A healthy rodent room is <em>mostly
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quiet</em> — that's the first thing that trips up new techs. They expect to hear the
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animals and instead they hear: the low constant drone of the individually ventilated
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cage (IVC) rack fans, the soft hiss of supply air through the diffusers, an occasional
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water-nipple drip, and the papery shush of bedding when someone shifts in a nest.
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That's the baseline. Dial that in and hold it in your head, because everything after
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this is a deviation from <em>that</em>, not from "silence."
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</p>
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<div class="note">
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<div class="pen">Margin: the HVAC is your metronome.</div>
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<p>
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Park yourself at the door, breathe, and let the ventilation become background.
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Once it does, a change in the <em>rate or timbre</em> of that drone — a rack fan seizing,
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a filter loading up — is itself a signal. Dirty filters change the pressure the
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animals are breathing against, and a lab that "smells fine" can still be breathing
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thin. I've caught two rack fans dying from the sound before the alarm ever fired.
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</p>
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</div>
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<h2><span class="num">II.</span>The sound inventory — what you're actually hearing</h2>
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<p>
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Here's the cheat sheet I keep on the rounds card. The flags are how I tag each sound
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on the rack log. <strong>Gray</strong> means keep watching; <strong>red</strong> means that cage gets looked at today,
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no exceptions.
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</p>
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<table class="sound">
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<thead>
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<tr><th>Sound</th><th>What it reads like</th><th>Flag</th></tr>
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</thead>
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<tbody>
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<tr>
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<td>Rhythmic grinding / chattering</td>
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<td><strong>Bruxism.</strong> In rats, a low, steady grind is a contentment hum — they do it while sleeping happily. In mice, and in any animal that's stressed, grinding can be pain or resentment. Context is everything: <em>who</em> is grinding, and are they grinding alone and moving less?</td>
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<td class="flag">GREY / watch</td>
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</tr>
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<tr>
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<td>Snuffling, sneeze bursts</td>
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<td>The classic early respiratory tell. In mice and rats it often means bedding dust irritating the airways, or — in a sentinel colony — an emerging pathogen (think Mycoplasma in rats). One animal snuffling may be bedding. Half the rack snuffling is a conversation you need to start with the vet.</td>
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<td class="flag">GREY → RED</td>
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</tr>
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<tr>
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<td>Wheeze / stridor on each breath</td>
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<td>Upper airway narrowing. In rats, check the nares for hard porphyrin crust — red-caked nostrils that look like dried blood but are stress pigment. That's a red-flag obstruction. It does not resolve on its own.</td>
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<td class="flag">RED</td>
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</tr>
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<tr>
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<td>Wet, "rattly" breathing</td>
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<td>Pulmonary congestion — fluid in the airways. This is the sound that says "today," not "this week." It can go bad inside hours in a small-chested animal.</td>
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<td class="flag">RED</td>
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</tr>
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<tr>
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<td>Squeaks / squeals</td>
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<td>Much of rodent vocalization is ultrasonic — you won't hear it at all. The audible squeals you <em>do</em> hear are often fighting, a stuck foot in an ID ear tag, or pain. A sudden squeak-burst followed by sudden quiet is either a scuffle or a predator-response freeze. Pop open the cage and look.</td>
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<td class="flag">GREY → CHECK</td>
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</tr>
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<tr>
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<td>The wrong kind of quiet</td>
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<td>The sneakiest one. A rack full of mice that should be grooming, gnawing, and rustling <em>and isn't</em> — that flat, heavy stillness — is often a sicker room than one making noise. Activity <em>failures</em> are respiratory too: a mouse conserving energy isn't running its wheel.</td>
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<td class="flag">RED</td>
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</tr>
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</tbody>
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</table>
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<h2><span class="num">III.</span>Why by ear beats by eye, and beats by instrument</h2>
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<p>
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A sick mouse doesn't look sick until it's well past sick — they're prey animals, hardwired
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to hide it. The eye misses it until the fur goes rough and the back hunches. The stethoscope
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is great once a cage is in your hands, but it only listens to <em>one</em> animal at a time,
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and you can't scope two thousand mice before coffee.
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</p>
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<p>
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The two-minute listen gives you <em>the whole room</em> in one pass, and it gives you the
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trend — last Tuesday the room hummed, this Tuesday there's a snuffle under the drone.
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That's the 12-hour head start. Overt signs buy you a conversation; the sound buys you a
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treatment window. In a breeding or study colony, a 12-hour head start can be the entire
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difference between a salvageable census and a notification the director has to make.
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</p>
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<div class="note">
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<div class="pen">Margin: hear it first, confirm with eyes.</div>
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<p>
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The rule I drill into every shadowing tech: the ear <em>points you</em>, the eye <em>confirms you</em>,
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the hands <em>act</em>. You don't diagnose by earshot — you <strong>triage</strong> by earshot. The ear is the
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sentry; it's never the judge. Anything you flag this way gets confirmed at the cage before
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anything is logged as fact.
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</p>
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</div>
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<blockquote>
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"A quiet animal isn't a calm one. It might be conserving its last good breath. The
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difference between the two is the whole job — and the ear is how you start to tell them apart."
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</blockquote>
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<h2><span class="num">IV.</span>The failure modes — why good techs miss it anyway</h2>
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<p>
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Nobody sets out to miss a sick animal. Here's where the listen breaks down, so you can
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defend against it:
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</p>
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<div class="card">
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<h3>Failure modes</h3>
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<ul>
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<li><strong>Rushing the door.</strong> The fastest walk-through hears nothing. The listen is a discipline, not a pause — it has to be two whole minutes, door closed behind you, before you touch a cage.</li>
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<li><strong>A mask of "normal."</strong> A rack fan that's been dying for a week is now your "normal." You can't baseline a room on a single day — baseline it on a season, and write it down.</li>
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<li><strong>Masking sounds.</strong> A radio or a loud hallway masks the high-frequency tells. Keep the space intentionally quiet during rounds. If you can't, learn what the room sounds like <em>through</em> the noise — a room's texture changes even under music.</li>
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<li><strong>Only listening up close.</strong> The stethoscope is a magnifier; the whole-room listen is the survey. Both, always in that order, or you'll never see the pattern — just the individual.</li>
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<li><strong>Not logging.</strong> You heard a snuffle Tuesday and forgot by Friday. The rack log is the memory your brain isn't. One keystroke, one flagged cage — that's the whole system.</li>
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</ul>
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</div>
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<h2><span class="num">V.</span>The rounds workflow — put it on the card</h2>
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<p>
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Here's the card I actually carry, taped to the inside of the rack log. Steal it, adapt it,
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but <em>keep the order</em> — the order is the point.
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</p>
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<div class="card">
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<h3>■ The Two-Minute Listen — rounds card</h3>
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<ol class="check">
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<li>Close the door behind you. Shut up (not just your mouth — your whole hurry).</li>
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<li>0:00–0:30 — hear the room. Note the rack-fan drone and the supply hiss. Is the texture <em>normal for this season</em>?</li>
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<li>0:30–1:30 — sweep the room end-to-end, one rack at a time. Compose the soundscape: activity rustle, grooming, the absence of either.</li>
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<li>1:30–2:00 — stop, hold still, and listen for the <em>thin</em> sounds: a wheeze under the drone, a snuffle that shouldn't be there.</li>
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<li>Flag anything. Note the <strong>rack position</strong> — not just "that mouse," but <em>which rack, which shelf, which side.</em> Patterns live in positions.</li>
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<li>Check the flagged cages by eye and by stethoscope, in that order. Confirm, then act per protocol.</li>
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<li>Log it. One line: position, sound, what you saw, what you did. That line is the whole point.</li>
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</ol>
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</div>
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<div class="figure">
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<img src="https://images.pexels.com/photos/6235241/pexels-photo-6235241.jpeg?auto=compress&cs=tinysrgb&dpr=2&h=650&w=940"
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alt="The stethoscope confirms what the ear already flagged — hear first, confirm second." loading="lazy">
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<figcaption>FIG. 2 — The stethoscope confirms; it doesn't patrol. The ear is the sentry.</figcaption>
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</div>
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<h2><span class="num">VI.</span>When the ear <em>is</em> the treatment</h2>
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<p>
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There's a strangely good punchline to all this protocol: the animals learn you're listening.
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A room that's visited quietly, slowly, and consistently is a calmer room — rodents habituate
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to a tech who moves like weather, not like a predator. The two-minute listen is also enrichment.
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The first time I stopped rushing the rounds, I watched a rack of rats go from scattering at the
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door to <em>staying out</em>, watching me in that bright, whiskered way. The sound of a person who is
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not a threat is itself a kindness a lab animal can feel.
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</p>
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<p>
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Good care is mostly patience with a protocol on top. The ear is just the cheapest, earliest
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instrument you own — free, always on, and it never wakes a cage to take a reading.
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</p>
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<div class="linkrow">
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<a href="https://4ort.mov/w/5TJvzCRTRWkkWfW7qSdXw4">▶ Watch the companion film</a>
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<a href="enrichment-field-guide.html">Enrichment Field Guide</a>
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<a href="husbandry.html">Daily Husbandry</a>
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<a href="biosafety.html">Biosafety Levels</a>
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</div>
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<h2 style="border-top:1px solid var(--rule);font-size:1.1rem"><span class="num">❦</span>Field notes worth keeping</h2>
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|
<div class="fort-citizen" data-fort="citizen" data-name="amy-tucker"></div>
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<p style="margin-top:14px;font-size:.92rem;color:var(--ink-soft)">
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Sound is a discipline across the whole town — from reading a burn scene to the feel of a
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cavitating pump. This manual is one lane of a bigger truth: the people who read the world
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before they judge it are the ones who keep things alive.
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</p>
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<div class="foot">
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<span>Field Manual No. 2 · companion to 4ort.mov/w/5TJvzCRTRWkkWfW7qSdXw4</span>
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<span>technique drawn from lab animal husbandry best practice</span>
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</div>
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<div class="verso">printed on quiet · Akira Robinson · Decatur, GA</div>
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