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- Agkistrodon piscivorus conanti : A subspecies of the cottonmouth (Agkistrodon piscivorus) found east of the Mississippi River.
- Agricultural show : A public event showcasing the equipment, animals, sports and recreation associated with the occupations of agriculture and animal husbandry.
- Alipiopsitta xanthops (Yellow-faced Parrot) : A species of the genus Alipiopsitta, found in the cerrado region of Brazil and adjacent Bolivia.
- Animalier : An artist whose specialty is depicting animals.
- Animal : A multicellular organism that feeds on other organisms, and is distinguished from plants, fungi, and unicellular organisms.
- Ara autocthones (Saint Croix Macaw) : an extinct species of bird in the parrot family that was found on the island of Saint Croix, in the Virgin Islands
- Barnardius zonarius : A parrot native to all mainland Australian states.
- Biodiversity hotspot : A species-rich ecosystem in danger of destruction by human activities.
- Biodiversity : The study of the range of life forms in a given ecosystem.
- Bowerbird : Bird of the family Ptilonorhynchidae of Australia and New Guinea, the males of which build large elaborate structures of grasses, twigs, and brightly colored materials to attract females.
- Brain evolution : The process by which the central nervous system changed over many generations.
- Brain size : Umbrella term for various measures of how big a brain is.
- Cacatuidae (Cockatoos) : 21 bird species belonging to the family Cacatuidae, and the order Psittaciformes, found in Australasia.
- Chips (food) : Strips of skinless potato that are grilled, deep-fried or baked until their outsides are crisp and approaching golden brown in colour
- Circulatory system : Organ system that passes nutrients, gases, hormones, blood cells, nitrogen waste products, etc. to and from cells in the body.
- Circus melanoleucos (Pied Harrier) : A species of harrier found in south and south-east Asia.
- Column (botany) : is a structure found in the flowers of some plant families such as Aristolochiaceae, Orchidaceae, and Stylidiaceae, which is the result of the fusion of all sexual parts of the flower into a single organ.
- Dacrydium cupressinum : A large evergreen coniferous tree endemic to the forests of New Zealand.
- Dinosaur : widely distributed and diverse group of generally large reptiles that lived from approximately 215 to 65 million years ago.
- Ernst Mayr : (1904-2005) German biologist and major proponent of evolutionary philosophy.
- Eudocimus ruber (Scarlet Ibis) : Species of ibis that occurs in tropical South America and Trinidad and Tobago.
- Fixed-wing aircraft : Vehicles that remain aloft using the lift from the flow of air over wings which are fixed in position, in relation to the rest of their structure.
- Flight (biology) : Aerial locomotion by living organisms.
- Flower : The part of a flowering plant (angiosperm) containing its reproductive organs.
- Fuller brooch : Late 9th century Anglo-Saxon art, consisting of a large disc made of hammered sheet silver inlaid with black niello and with a diameter of 11.4 cm.
- Gallirallus australis (Weka) : Flightless bird species of the rail family, endemic to New Zealand.
- Graydidascalus brachyurus (Short-tailed Parrot) : Only species of the genus Graydidascalus, found along both banks of the Amazon river and other major Amazonian rivers in Brazil, Colombia, Ecuador and Peru.
- Green Anaconda : Largest member of the boa family of snakes and a member of the super-order Squamata, known to live in the seasonally flooded lowlands surrounding the Amazon basin.
- Gyrification : The folding process during brain development, or the extent of folding.
- Hyena coprolites and palaeoecology : A reliable source of evidence for species identification, animal diet, patterns of use of the environment, and animal-human relations in the past.
- Insect : One of numerous small arthropod animals with six legs, an exoskeleton that grows by molting, and oftentimes wings.
- Intelligence (biology) : An organism's capacity to make adaptive decisions based on information about its internal state or that of its environment.
- John James Audubon : West Indian-American illustrator and animalier, known for his illustrations of birds. The father of wildlife artist James Woodhouse Audubon
- Kleptoparasitism : The stealing of food items procured by other animals.
- Life extension : Medical and non-medical attempts to slow down or reverse the processes of aging, to extend both the maximum and average lifespan.
- Maximum life span : Measure of the maximum amount of time one or more members of a group has been observed to survive between birth and death.
- Murchison Falls National Park : Uganda's largest national park and game reserve.
- Nativism (psychology) : theory that certain traits of a species emerge from a mind that is already prepared for its environment, e.g. the language ability is not learned but 'acquired' due to innate processes.
- Noun class : System which categorises and marks the nouns of a language according to their meaning, form or pronunciation; commonly known as 'grammatical gender', but many languages have several noun classes.
- Orchid : Any plant classified under Orchidaceae, one of the largest plant families and the largest among Monocotyledons.
- Origin of music : The evolutionary background of the human capacity for music.
- Oriolus isabellae (Isabela Oriole) : Oriole species, endemic to Luzon, the Philippines, presumed extinct until its rediscovery 1993.
- Owl : Nocturnal birds of prey of the order Strigiformes, having hooked and feathered talons, large heads with short hooked beaks, large eyes set forward, and fluffy plumage that allows for almost noiseless flight.
- Penguin : Large-bodied flightless birds found from their southernmost range on Antarctica to north on the Galapagos Islands at the equator.
- Pet : Particularly cherished or indulged companion animal.
- Pollenizer : The plant that provides pollen for pollination of another plant
- Pollination : Process by which pollen is transferred in plants from the male reproductive organ (stamen or staminate cone) to the female reproductive organ (pistil or pistillate cone), thereby enabling fertilisation and sexual reproduction.
- Rejuvenation (aging) : Hypothetical reversal of the aging process, aiming to repair the damage that is associated with aging or replacement of damaged tissue with new tissue.
- Sex-determination system : A biological process that determines the development of sexual gender.
- Song Dynasty : (960–1279 CE); a culturally rich and sophisticated era in China.
- Species (biology) : A fundamental unit of biological classification - a set of individual organisms that produce fertile offspring.
- Symbiosis : The interdependence of organisms belonging to different species.
- The Twelve Days of Christmas (carol) : English Christmas carol which enumerates a series of increasingly grandiose gifts given on each of the twelve days of Christmas, ultimately leaving the singer with 364 gifts from her 'true love.'
- Thrush (disambiguation) : Add brief definition or description
- Vasopressin : A hormone also called (arginine vasopressin, (AVP); formerly known as antidiuretic hormone, ADH), produced in the hypothalamus secreted from the posterior pituitary that causes kidneys to concentrate urine to conserve water, also causes vasoconstriction.