Drury R. Reavill Pathology Database

Epidemiology of Diseases in Exotic Animals

Patterns mined from 84,190 pathology records — 36,258 with a classified disease process and 45,946 with a usable age. Counts based on diagnosis-text keywords are estimates, not audited case series.

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What brings each class to the pathologist

Share of classified diagnoses by disease process. Tumors dominate the mammal caseload (41.5% of classified diagnoses) but are far less frequent in reptiles and amphibians, where infectious and inflammatory disease lead.

Birdsn=17,053
Mammalsn=11,499
Reptilesn=4,609
Fishn=1,878
Amphibiansn=1,145
TumorInflammatoryInfectionMetabolic/degenerativeOther

Tumor risk climbs steeply with age

Among diagnoses with a classified process and a usable age, the tumor share rises from under 4% in animals below one year to roughly half of diagnoses in older mammals. Points are omitted where fewer than 40 records fall in a bin.

0%20%40%60%0–11–33–55–88–1212–2020–30Age group (years)All classes, 0–1 yrs: 3.5%All classes, 1–3 yrs: 27.5%All classes, 3–5 yrs: 38.1%All classes, 5–8 yrs: 42.6%All classes, 8–12 yrs: 34%All classes, 12–20 yrs: 26.1%All classes, 20–30 yrs: 27.8%All classesBirds, 0–1 yrs: 1.9%Birds, 1–3 yrs: 12.6%Birds, 3–5 yrs: 21.5%Birds, 5–8 yrs: 23.6%Birds, 8–12 yrs: 23.1%Birds, 12–20 yrs: 23.1%Birds, 20–30 yrs: 28.9%BirdsMammals, 0–1 yrs: 6.6%Mammals, 1–3 yrs: 44.3%Mammals, 3–5 yrs: 52.7%Mammals, 5–8 yrs: 61.1%Mammals, 8–12 yrs: 52.4%Mammals, 12–20 yrs: 39.3%Mammals, 20–30 yrs: 9.9%MammalsReptiles, 0–1 yrs: 1.5%Reptiles, 1–3 yrs: 9.5%Reptiles, 3–5 yrs: 20.9%Reptiles, 5–8 yrs: 24.1%Reptiles, 8–12 yrs: 26.6%Reptiles, 12–20 yrs: 28.7%Reptiles, 20–30 yrs: 29.5%Reptiles

Species with the highest tumor burden

Tumor share of classified diagnoses in species with at least 250 submissions. Ferrets top the archive — nearly 6 of every 10 classified diagnoses are neoplastic.

  • Ferret59.2% · n=2,474
  • Guinea Pig50.8% · n=1,136
  • Hedgehog48.7% · n=456
  • Rabbit47% · n=2,119
  • Budgerigar41.2% · n=1,078
  • Rat39.6% · n=1,049
  • Chicken, Domestic34.7% · n=395
  • Hamster34% · n=312
  • Cockatiel32.8% · n=1,839
  • Parakeet29.9% · n=204
  • Lovebird29.6% · n=318
  • Koi28.3% · n=212
  • Amazon, Double Yellow Head26.1% · n=161
  • Dragon, Bearded25.3% · n=805

Most common named tumor types

Archive-wide counts of tumor entities named in the diagnosis text. Lymphoma leads across classes; squamous cell carcinoma and the reptile pigment-cell (chromatophoroma) family follow.

  • Lymphoma / leukemia1,639
  • Squamous cell carcinoma1,252
  • Adrenal neoplasia1,195
  • Lipoma / liposarcoma955
  • Adenocarcinoma908
  • Papilloma792
  • Basal / trichoblastoma686
  • Hemangioma / hemangiosarcoma602
  • Fibrosarcoma493
  • Sertoli / seminoma303
  • Melanoma190
  • Osteoma / osteosarcoma158
  • Myxoma / myxosarcoma136
  • Chromatophoroma family122
  • Insulinoma9

Signature species–disease associations

Conditions strongly over-represented in one species relative to the rest of its class (bar length on a log scale; minimum 10 cases). The screen recovers classic associations — budgerigar pituitary tumors, boa inclusion body disease — alongside less-reported signals such as leopard gecko xanthomatosis.

Budgerigar — Pituitary tumor27 cases · 1.3% of species
74.3×
Mouse — Cryptosporidiosis23 cases · 6.6% of species
44.3×
Finch, Gouldian — Cryptosporidiosis27 cases · 10.8% of species
38.7×
Dragon, Bearded — Adenovirus13 cases · 1.1% of species
35.1×
Boa — Inclusion body disease33 cases · 14.8% of species
28.1×
Boa, Red Tail — Inclusion body disease35 cases · 13.8% of species
27.4×
Gecko, Leopard — Xanthomatosis25 cases · 9.7% of species
20.9×
Dragon, Bearded — Nannizziopsis (CANV)27 cases · 2.2% of species
20.8×
Rat — Pituitary tumor12 cases · 0.8% of species
16.6×
Gecko, Leopard — Cryptosporidiosis59 cases · 22.9% of species
15.2×
Chicken, Domestic — Lymphoma71 cases · 11.9% of species
14.4×
Budgerigar — Renal tumor17 cases · 0.8% of species
13.4×
Ferret — Adrenal disease/neoplasia1839 cases · 30.6% of species
11.9×
Budgerigar — Macrorhabdus (gastric yeast)190 cases · 9.3% of species
10.5×
Rabbit — Uterine adenocarcinoma182 cases · 4.9% of species
10.5×
Hedgehog — Squamous cell carcinoma89 cases · 11.3% of species
10.2×
Amazon, Yellow Nape — Bile duct carcinoma10 cases · 2.1% of species
9.1×
Macaw, Greenwing — Cloacal papillomatosis45 cases · 9.3% of species
8.8×

Which body systems are affected, class by class

Percentage of classified diagnoses assigned to each organ system. Skin disease dominates bird and reptile submissions; digestive and systemic disease weigh heavier in mammals and fish.

SkinDigestiveSystemicRespiratoryUrinaryReproductiveMusculoSkeletalCardioVascularHemeLymphEndocrine
Birds20.3%26.7%13.8%10.2%5.6%4.9%3.4%4.3%0.8%
Mammals31.9%17.1%8.2%8.6%5.1%7.1%3.5%2.4%6.5%
Reptiles21.2%29%17.3%5.4%6.1%3.7%7.9%1.4%0.2%0.5%
Fish18.8%17.8%17.9%7.8%7%2.2%4.9%2%0.1%0.6%
Amphibians18.3%24.9%21.1%3.1%14.6%0.5%4%1.4%0.3%0.2%

Infections: which agents, in which classes

Among diagnoses classified as infectious, the causative agent group recorded by the pathologist. Fungal disease looms large in reptiles; viral infections take a bigger share in birds.

Birdsn=2,585
Mammalsn=1,158
Reptilesn=1,266
Fishn=423
Amphibiansn=384
BacteriaFungusVirusProtozoaMetazoanYeastUnspecified

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