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These animals have been observed practicing homosexual courtship, sexual behavior, affection, pair bonding, or parenting. Bruce Bagemihl writes that the presence of same-sex sexual behavior was not officially observed on a large scale until the 1990s due to possible observer bias caused by social attitudes towards LGBT people, which made ...
There are a variety of proposed mechanisms by which social grooming behavior has been hypothesized to increase fitness.These evolutionary advantages may come in the form of health benefits including reduction in disease transmission and stress levels, maintenance of social structures, and direct improvement of fitness as a measure of survival.
This page gives a list of domesticated animals, [1] also including a list of animals which are or may be currently undergoing the process of domestication and animals ...
Male peacock spider, Maratus volans, courtship display In some species, males will perform ritualized movements to attract females. The male six-plumed bird-of-paradise (Parotia lawesii) exemplifies male courtship display with its ritualized "ballerina dance" and unique occipital and breast feathers that serve to stimulate the female visual system. [7]
Up until the 1990s, Freudian and psychoanalytic theories were historically used to describe why people collect. [15] Early theories began in the early- and mid-1900s based on both theories of psychosexual development and drive theory. Freud suggested the idea that collecting stems from toilet training behavior. [16]
With few exceptions, animals consume organic material, breathe oxygen, are able to move, reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described —of which around 1 million are insects —but it has been estimated there are over 7 million ...
List of individual apes; Oldest hominids; List of individual bears. List of giant pandas; List of individual birds; List of individual cats. List of longest-living cats; List of individual dogs. List of longest-living dogs; List of individual elephants; List of historical horses; List of individual bovines; List of individual cetaceans. List of ...
Gorilla Great reed warbler. When two animals mate, they both share an interest in the success of the offspring, though often to different extremes. Unless the male and female are perfectly monogamous, meaning that they mate for life and take no other partners, even after the original mate's death, the amount of parental care will vary. [7]