Search results
Results from the WOW.Com Content Network
Birds are solely gonochoric, [100] meaning they have two sexes: either female or male. The sex of birds is determined by the Z and W sex chromosomes, rather than by the X and Y chromosomes present in mammals. Male birds have two Z chromosomes (ZZ), and female birds have a W chromosome and a Z chromosome (WZ). [77]
A mammal (from Latin mamma 'breast') [1] is a vertebrate animal of the class Mammalia (/ m ə ˈ m eɪ l i. ə /).Mammals are characterised by the presence of milk-producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair, and three middle ear bones.
2g Other birds: Tawny owl (Strix aluco) [100] date uncertain Europe (including the United Kingdom) pest control, show, pets 2g Other birds: Puna ibis (Plegadis ridgwayi) date uncertain Peru: meat, eggs, pest control 2g Other birds: Celebes warty pig (Sus celebensis) [101] date uncertain Sulawesi: meat, tusks, pets Historically farmed 1a ...
A mammal (from Latin mamma 'breast') is a vertebrate animal of the class Mammalia (/ m ə ˈ m eɪ l i. ə /). Mammals are characterised by the presence of milk -producing mammary glands for feeding their young, a broad neocortex region of the brain, fur or hair , and three middle ear bones .
This article lists living orders and families of birds. In total there are about 11,000 species of birds described as of 2024, [1] though one estimate of the real number places it at almost 20,000. [2] The order passerines (perching birds) alone accounts for well over 5,000 species.
Insects, birds and mammals play roles in literature and film, [202] such as in giant bug movies. [203] [204] [205] Animals including insects [198] and mammals [206] feature in mythology and religion. The scarab beetle was sacred in ancient Egypt, [207] and the cow is sacred in Hinduism. [208]
In birds and mammals altricial species are those whose newly hatched or born young are relatively immobile, lack hair or down, are not able to obtain food on their own, and must be cared for by adults; closed eyes are common, though not ubiquitous. Altricial young are born helpless and require care for a length of time.
In 1997, the classification of mammals was revised by Malcolm C. McKenna and Susan K. Bell. [10] The Classification of Mammals Above the species level, here referred to as the "McKenna/Bell classification", is a comprehensive work on the systematics, relationships, and occurrences of all mammal taxa, living and extinct, down through the rank of ...