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Interspecies friendship. An interspecies friendship is a nonsexual bond that is formed between animals of different species. [1] Numerous cases of interspecies friendships among wild and domesticated animals have been reported and documented with photography and video. [1] Domestication of animals has led to interspecies friendships between ...
The axolotl (/ ˈæksəlɒtəl / ⓘ; from Classical Nahuatl: āxōlōtl [aːˈʃoːloːtɬ] ⓘ) (Ambystoma mexicanum) [3] is a paedomorphic salamander closely related to the tiger salamander. [3][4][5] It is unusual among amphibians in that it reaches adulthood without undergoing metamorphosis. Instead of taking to the land, adults remain ...
Blood type (non-human) Animal erythrocytes have cell surface antigens that undergo polymorphism and give rise to blood types. Antigens from the human ABO blood group system are also found in apes and Old World monkeys, and the types trace back to the origin of humanoids. [1] Other animal blood sometimes agglutinates (to varying levels of ...
Raccoon. The raccoon (/ rəˈkuːn / or US: / ræˈkuːn / ⓘ, Procyon lotor), also spelled racoon[3] and sometimes called the common raccoon or northern raccoon to distinguish it from the other species, is a mammal native to North America. It is the largest of the procyonid family, having a body length of 40 to 70 cm (16 to 28 in), and a body ...
Altruism (biology) Olive baboons grooming. In biology, altruism refers to behaviour by an individual that increases the fitness of another individual while decreasing their own. [1] Altruism in this sense is different from the philosophical concept of altruism, in which an action would only be called "altruistic" if it was done with the ...
In a 2004 online poll involving more than 50,000 people from 73 countries, the tiger was voted the world's favourite animal with 21% of the vote, narrowly beating the dog. [248] Similarly, a 2018 study found the tiger to be the most popular wild animal based on surveys, as well as appearances on websites of major zoos and posters of some ...
Parasitism is a close relationship between species, where one organism, the parasite, lives on or inside another organism, the host, causing it some harm, and is adapted structurally to this way of life. [ 1 ] The entomologist E. O. Wilson characterised parasites as "predators that eat prey in units of less than one". [ 2 ]
The sperm whale brain is the largest known of any modern or extinct animal, weighing on average about 7.8 kilograms (17 lb) [61] [62] (with the smallest known weighing 6.4 kilograms (14 lb) and the largest known weighing 9.2 kilograms (20 lb)), [44] [45] more than five times heavier than a human brain, and has a volume of about 8,000 cm 3. [63]