How to write an institutional mortality plan your team will actually use
A good mortality plan names who decides, who calls whom, where the body is stored and which aftercare routes are pre-approved for each size of animal. AZA Standard 2.5.1[1] already expects necropsy, so the plan's real job is everything around it.
By the Zoo & Wildlife Cremation Services editorial team · Updated September 24, 2026 · 6 min read · Sources
- A one-page decision chain for the first hour
- Pre-approved routes by animal size and risk
- Records that satisfy inspectors and donors
The short answer
What should an institutional mortality plan actually contain?
At minimum: a named decision chain, a cold-storage plan, a pathology route, a pre-approved aftercare route for each weight band, a disease escalation step and a records template. Everything else is detail. If the keeper who finds the animal at 6 a.m. can follow the first page without phoning anyone senior, the plan works.
Most institutions already have pieces of this scattered across a veterinary SOP, a facilities contact sheet and someone's memory. The value of writing it down is that the pieces agree. When the curator, the vet and the finance office each think a different person approves an outside cremation, the body sits in the cooler while they sort it out.
The scale matters too. About 800,000 animals[2] live in AZA-accredited facilities alone, and plenty more in sanctuaries, rescue centers and private collections. Deaths are routine across that population, even if each one feels anything but routine to the people who knew the animal.
Roles
Who needs to be named in the decision chain?
Write roles, not names, and keep a separate contact sheet that someone updates every quarter. People leave; roles don't. A workable chain has five links:
- The finder. Whoever discovers the death or witnesses the euthanasia. Their job is to secure the area, note the time and call the on-call vet.
- The attending veterinarian. Decides whether necropsy is needed, whether fresh samples must be taken and whether disease is suspected.
- The releasing authority. Usually the curator or director. Signs off that the body may leave the institution and on which route.
- The aftercare coordinator. Books the lab, transport and crematory, and holds the purchase order or card.
- The records keeper. Closes the file: animal ID, hand-offs, certificates, retained tissues, final disposition.
In a small sanctuary one person may hold three of those roles. That's fine, as long as the plan says so and names a backup for each. The worst gaps appear on weekends, when the only person with authority to release a body is on a plane.
How does your organization arrange aftercare today?
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The first hour
What should happen in the first hour after a death?
The first page of the plan should be a checklist someone can follow half-awake. Keep it to one side of paper and laminate a copy for every animal area.
- Secure the enclosure and move herd or troop mates if the vet agrees it's safe.
- Record the time, location, who found the animal and anything unusual nearby.
- Call the on-call vet before moving the body, unless it's in water or a hazard.
- Tag the body with the records ID before it leaves the enclosure.
- Move it to the designated cold store, or call for the refrigerated trailer if it's too big.
- Start the hand-off log and note who has custody at each step.
Our article on the necropsy and aftercare workflow goes step by step through what happens once the body reaches the pathology team.
Pre-approved routes
Which aftercare routes should be pre-approved for each size of animal?
Pre-approval is the single biggest time saver. If the plan already says that birds and reptiles under 50 lb go to the lab and then to a named crematory, nobody has to convene a meeting on a Sunday. Keep a short table in the plan and review it every year.
| Weight band | Default route | Needs extra sign-off when |
|---|---|---|
| Under 50 lb | Necropsy, then lab disposal or individual cremation | Keepers or donors want ashes returned |
| 50 to 500 lb | Necropsy, then individual cremation at a large-animal provider | Transport crosses a state or county line |
| 500 to 1,500 lb | Necropsy on site or at a lab, then equine-size cremation or tissue digestion | No chamber within a day's drive |
| Over 1,500 lb | Necropsy on site, then sectioned cremation, digestion, rendering or burial | Any route, always curator and vet together |
The size limits are real. A large agricultural incinerator holds up to a 1,500 lb load[3] (one manufacturer's rating), so anything heavier needs sectioning or a different route entirely. The livestock mortality planner turns your heaviest animals' weights into loads, pit sizes and rough costs, which is useful when you draft this table.
By our estimate, the burn phase alone for an 1,100 lb animal is at least 4.4 hours[4] at 250 lb an hour, before preheating and cool-down, so a large case can occupy a chamber for most of a working day.
Free tool
Livestock mortality planner
Plan disposal capacity and costs for farm losses, from one animal to a herd.
For each band, list a first-choice and a second-choice provider. The services overview explains what each route involves, and the vendor checklist in questions institutions should ask vendors helps you vet them before they go in the plan.
When the rules take over
How should the plan handle a suspected reportable disease?
Add a hard stop. If the vet suspects a reportable or zoonotic disease, every pre-approved route is suspended until the state veterinarian or animal health authority says otherwise. Write that sentence into the plan in bold so nobody books a crematory out of habit.
Avian influenza is the obvious example. Wild bird surveillance in the US recorded 15,542 detections[5] of H5 influenza between late 2021 and 2025, and zoos with open-air aviaries or waterfowl ponds sit right in that exposure. Chronic wasting disease in cervids and rabies in bats and carnivores are others worth naming for your own region.
The EPA's guidance on carcass management during avian influenza outbreaks lists composting and permitted landfills as preferred methods, which tells you how regulators think about bird deaths at scale. The CDC's bird flu situation summary is the quickest way to check how the human-health picture stands before you brief staff. State disposal clocks and rendering access differ widely, and our locations pages summarize them by area.
Your state rules may also set a clock. Many US states require dead livestock and horses to be disposed of within 24-72 hours[6] of death, especially after euthanasia, although necropsy and cold storage usually satisfy the spirit of those rules. Confirm with your regulator how the timelines apply to an institution holding a body for pathology.
Paperwork
What records should the plan require for every death?
AZA Standard 2.5.3[7] asks for dedicated cadaver storage and disposal under local and federal law, which means an inspector may ask you to show where a particular animal ended up. A one-page closing record per death answers that question for years.
- Records ID, species, sex, age and body weight
- Date, time and cause or manner of death, once known
- Necropsy accession number and the lab that holds it
- Tissues, skeleton, skin or gametes retained, and where they went
- Every custody hand-off with a signature and time
- Final route, provider, date and certificate number
Don't rely on your provider's paperwork to fill the gaps. One directory counts only 2 states[8] in the US that required written documentation for pet cremation consumers as of 2026, so a crematory's standard certificate may be thinner than you expect. Put your required fields in the service agreement.
Keeping it alive
How do you keep the plan current and the people ready?
Run a tabletop drill once a year: pick your heaviest animal, pretend it died at 4 p.m. on a Friday in August, and walk through who calls whom. Drills find the dead phone numbers and the trailer that got sold. They also let keepers see the plan before they need it, which makes the real day less shocking.
Zoo populations increasingly reach old age; in one comparison across more than 50 mammal species, zoo animals outlived wild ones in 84%[9] of species. That's good news, and it means geriatric planning deserves its own annex. Our article on pre-planning aftercare for an aging animal covers that individual-animal side.
Finally, write people into the plan. Name who tells the keeper team, who offers time off and who handles the public announcement. The guide on supporting keepers after an animal dies has a template you can adapt. When you're ready to add providers to your plan, send us your locations and weight bands.
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Reader polls
What would you choose?
Vote anonymously and see how other readers answered. The results are live counts from people who visit this site, so they show real opinions, not a scientific sample.
How does your organization arrange aftercare today?
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After a death in your collection, how often is there a necropsy before aftercare?
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Questions people ask
Is a mortality plan required for AZA accreditation?
AZA standards expect necropsy of deceased animals, dedicated cadaver storage and lawful disposal, and inspectors look for written procedures that show how those happen. A mortality plan is the natural home for that. Your accreditation coordinator can confirm exactly which documents the current standards and your last inspection expect.
How often should a zoo mortality plan be reviewed?
Review the contact sheet every quarter and the full plan once a year, or after any death where something went wrong. Provider capacity, prices and disease rules change, and staff turnover quietly breaks phone trees. A short annual tabletop drill is the easiest way to find the gaps.
Should small sanctuaries bother with a formal plan?
Yes, but it can be two pages. A sanctuary with one vet and a handful of staff still needs to know who can release a body, where it's stored, which lab and crematory to call and how to recognize a disease case. Small teams are hit harder by confusion because there's no one to cover.
What if our largest animal is too big for any local crematory?
Write that down now and choose a fallback while there's time. Options include sectioned cremation over several loads, tissue digestion at a diagnostic lab, rendering where accepted, and on-grounds burial where your regulator allows it. Price and pre-approve at least one route for every animal over 1,500 lb.
Who should sign off on sending a body off site?
Usually two people: the attending veterinarian, confirming that necropsy and sampling are finished and no disease hold applies, and the curator or director, confirming the aftercare route and cost. Writing both signatures into the plan prevents a body leaving before the pathologist is done.
Can the mortality plan include keepers' wishes?
It should. Add a short section on whether keepers can spend time with the animal before necropsy, whether a portion of ashes can be requested, and who decides on memorials. Settling those questions in advance avoids painful arguments in the days after a loss.
Keep reading
Vetting aftercare vendors
What to ask before a provider goes into your plan.
From necropsy to aftercare
The step-by-step workflow once pathology takes over.
Aftercare routes we help arrange
Cremation, digestion, lab disposal and memorials.
Planning tools
Size loads, costs and ash weights for your collection.
Sources and our estimates
- [1] AZA accreditation Standard 2.5.1 says deceased zoo animals should be necropsied to find the cause of death, with all deceased animals (or a sample from a mass mortality) given a gross necropsy supported by histopathology at veterinary discretion. Association of Zoos and Aquariums - 2023 Accreditation Standards & Related Policies (Standard 2.5 Necropsy), as filed in Skagit County public record, 2023.
- [2] About 800,000 animals from roughly 6,000 species, including about 1,000 threatened or endangered species, live in AZA-accredited facilities; AZA had 238 accredited zoos and aquariums in 2025. Wikipedia - Association of Zoos and Aquariums (citing AZA), 2025.
- [3] An animal incinerator sized for agricultural and animal-control use holds up to 1,500 lb per load with a maximum burn rate of 250 lb per hour (manufacturer specification). B&L Cremation Systems (manufacturer) - BLI-1500 Animal Incinerator specifications.
- [4] At an average rate of 250 lb per hour, the burn phase for a 1,100 lb horse would take at least about 4.4 hours, not counting preheating and cool-down. Our estimate: 1,100 lb / 250 lb per hour. How we calculate.
- [5] Wild bird surveillance recorded 15,542 H5Nx HPAI detections in at least 193 wild bird species between December 2021 and September 2025, including 8,073 in sick or dead birds. USDA APHIS CEAH - Status and Epidemiologic Analyses of HPAI-affected Poultry Flocks, September 30, 2025 Interim Report, 2025.
- [6] State rules commonly require dead animals to be buried within 24 to 72 hours of death, especially when euthanized. Cornell Waste Management Institute & Penn State - Horse Mortality: Carcass Disposal Alternatives (2012), 2012.
- [7] AZA Standard 2.5.3 requires cadavers to be kept in a dedicated storage area before and after necropsy and remains to be disposed of under local and federal law. Association of Zoos and Aquariums - 2023 Accreditation Standards & Related Policies (Standard 2.5 Necropsy), as filed in Skagit County public record, 2023.
- [8] As of April 2026 only Illinois and Arizona mandated written documentation to consumers for pet cremation. FindPetCremations - Pet Cremation Laws & Regulations by State (2026), 2026.
- [9] Across more than 50 mammal species, zoo populations lived longer than wild populations in 84% of species. Tidiere M et al. Comparative analyses of longevity and senescence reveal variable survival benefits of living in zoos across mammals. Scientific Reports, 2016 (PMID 27819303), 2016.
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