Zoology: Substrates, Animal Nutrition, Veterinary Care, and Zoonoses

Comprehensive vocabulary flashcards covering zoological enclosure substrates, nutritional physiology, captive feeding practices, clinical veterinary care protocols, and major wildlife zoonoses.

Substrate

The material placed on the floor or bottom of an animal's cage, enclosure, or exhibit.

Concrete Substrate

A long-lasting, non-ingestible flooring material that is easy to sanitize but is very hard on joints, expensive to install, and prone to extreme temperature variations.

Pea Gravel Substrate

A loose, natural-looking outdoor substrate that drains liquid waste away without forming puddles and is less likely to clog drains than sand, though difficult to clean completely.

Cedar Shavings

A wood bedding material that should be avoided because its natural aromatic oils are toxic and irritating to animal respiratory tracts and eyes.

Corn Cob Bedding

An absorbent indoor bedding material that is easy to spot clean but molds easily when wet, produces dust, lacks odor control, and poses an impaction hazard if ingested.

Bumblefoot (Ulcerative Pododermatitis)

A common bacterial foot infection in birds, rodents, and rabbits typically characterized by abscess-like swelling and a dark necrotic scab, often exacerbated by unsuitable perches or wire flooring.

Cypress Mulch

A commercially sold bedding to avoid due to environmental concerns, as harvesting cypress stands destroys vital natural storm-protection barriers, wildlife habitats, and water filtration systems.

Crushed Limestone (Screenings)

A heavy outdoor substrate that packs down to provide good traction and durability, but appears unnaturally bright white upon installation and drains slowly.

Hypoglycemia

A critical metabolic state where blood glucose levels drop abnormally low, potentially precipitating seizures, coma, and death.

Endotherm

An organism that regulates its body temperature internally through metabolic heat production.

Ectotherm

An organism that relies on external environmental heat sources to regulate its internal body temperature.

Basal Metabolic Rate (BMR)

The baseline amount of energy expended by an organism at complete rest.

Maintenance Metabolic Rate (MMR)

The total caloric intake required by an organism to sustain constant body mass, accounting for BMR, age, ambient temperature, activity level, and physiological state.

Surface Area to Volume Ratio

A geometric relationship explaining why smaller animals lose body heat rapidly and must consume a substantially higher percentage of their body mass daily than larger animals.

Hindgut Fermentation

A digestive strategy seen in horses, rabbits, koalas, and ratites where symbiotic microbes digest plant cellulose within an enlarged cecum or large intestine.

Foregut Fermentation

A digestive mechanism utilized by ruminants (e.g., cattle, antelope, giraffes) featuring a multi-chambered stomach where food undergoes microbial fermentation before reaching the gastric stomach.

Coprophagy

The behavioral re-ingestion of fecal pellets by hindgut fermenters to absorb essential microbial nutrients in the upper digestive tract.

Rumination

The process of regurgitating semi-digested cud from the rumen back to the mouth for additional mechanical mastication.

Scurvy

A pathology resulting from a dietary deficiency in Vitamin C, causing ulcerative skin lesions, swollen limbs, arthralgia, necrotic gums, and tooth loss in humans and guinea pigs.

Thiaminase

An enzyme present in raw feeder fish like goldfish and fathead minnows that breaks down thiamin ($\text{Vitamin B}_1$), necessitating dietary supplementation to prevent neurologic collapse.

Calcium to Phosphorus Ratio (Ca:P)

The ideal mineral balance in an animal diet, typically targeted at $2:1$ (or $1:1$), to prevent phosphorus from leaching calcium out of skeletal structures.

Gut Loading

The practice of feeding nutrient- and mineral-dense rations (particularly calcium) to live insect prey immediately prior to offering them to captive insectivores.

Crop Milk

A nutrient-rich epithelial secretion high in proteins and lipids with zero carbohydrates, produced by both parent doves and pigeons to nourish altricial young.

Altricial

Avian offspring hatched in an undeveloped, featherless, and dependent state that necessitate frequent feedings ($\text{every } 15\text{ minutes}$ initially) and fast developmental growth.

Angel Wing

An avian anatomical deformity where the carpal joint twists laterally, preventing flight; associated with dietary imbalances such as excessive protein, inappropriate mineral ratios, and rapid growth.

Pyramiding

A permanent shell deformity in chelonians resulting in conical, raised scutes; caused by overfeeding dietary protein, insufficient UVB exposure, or inadequate ambient humidity during development.

Gout

An inflammatory condition caused by uric acid crystal accumulation within synovial joints or visceral organs, often precipitated by kidney disease, dehydration, or nutritional imbalances.

Quarantine

A biosecurity isolation procedure lasting a minimum of $30\text{ days}$ to assess health and prevent disease introduction from newly acquired animals into an established zoological collection.

Pinioning

The permanent surgical amputation of the distal wing tip at the carpal joint (wrist) of a bird to irreversibly prevent flight.

Euthanasia

The intentional, humane termination of an animal's life to eliminate intractable suffering; literally derived from the Greek terms meaning 'good death.'

Pre-Exposure Prophylaxis (PrEP)

A preventive series of rabies vaccinations consisting of $2\text{ doses}$ over $3-4\text{ weeks}$, recommended for individuals handling rabies vector species.

Post-Exposure Prophylaxis (PEP)

An emergency medical protocol consisting of human rabies immune globulin ($\text{HRIG}$) and a series of vaccinations administered to an individual exposed to a potential rabies vector.

Milwaukee Protocol

An intensive medical procedure using an induced coma to protect the central nervous system from swelling while giving the patient's immune system time to produce rabies antibodies.

Zoonosis

Any infectious disease caused by a virus, bacterium, fungus, or parasite that can be transmitted naturally between non-human animals and humans.

Reverse Zoonosis

The transmission of an infectious pathogen from a human host to an animal species.

Canine Distemper Virus

A highly contagious viral disease related to measles affecting carnivores (e.g., raccoons, skunks, foxes), presenting with ocular/nasal discharge, respiratory signs, and central nervous system deficits.

Botulism

A paralytic disease caused by ingesting neurotoxins produced by the anaerobic bacterium Clostridium botulinum, frequently occurring in warm, oxygen-depleted aquatic environments.

White-Nose Syndrome (WNS)

An emergent fungal epizootic caused by Pseudogymnoascus destructans ($\text{Pd}$) that targets cutaneous tissues of hibernating bats, causing premature arousal and fatal emaciation.

Songbird Ocular Syndrome (SOS)

A seasonal disease in fledgling passerines linked to periodic cicada emergences, caused by severe $\text{Vitamin A}$ deficiency from consuming headless cicada bodies.

Tetanus (Lockjaw)

A non-zoonotic neurological toxemia caused by Clostridium tetani spores inoculated via deep puncture wounds or bites, causing severe muscle spasms and whole-body arching.

Leptospirosis

A widespread bacterial zoonosis shed in rodent urine and transmitted via broken skin or water contact, which can progress to liver failure, meningitis, or renal collapse.

Salmonella

A ubiquitous bacterial enteric pathogen frequently shed subclinically by reptiles, birds, and livestock, causing acute gastroenteritis and fever in humans.

Erythema Migrans

The expanding, annular 'bullseye' cutaneous rash pathognomonic of early-stage Lyme disease infection following the bite of an infected vector tick.

West Nile Virus (WNV)

A flavivirus maintained in an enzootic cycle between Culex pipiens mosquitoes and wild birds, capable of causing neuroinvasive encephalitis in dead-end hosts like humans and equines.

Rabies Virus

A neurotropic rhabdovirus transmitted through infected saliva that travels along peripheral nerves at $1-2\text{ cm/day}$ to the brain, producing fatal acute encephalitis once symptoms manifest.

Sarcoptic Mange

A contagious, intensely pruritic dermatopathy caused by burrowing Sarcoptes scabiei mites, producing severe alopecia, hyperkeratosis, and crusting.

Baylisascaris procyonis

The common raccoon roundworm, whose resilient environmental eggs can be ingested by intermediate hosts and cause devastating neural or ocular larva migrans.

Toxoplasmosis

A coccidial protozoan infection with felids as definitive hosts; known to cause neurobehavioral changes in rodent hosts and reproductive/fetal pathology across warm-blooded animals.