Animals, birds, fish, insects, and aquatics Internet Colors - in Hex for
Fauna is all of the animal life of any particular region or time. The
corresponding term for plants is flora. Flora, fauna and other forms of life
such as fungi are collectively referred to as biota.
Infauna are benthic organisms that live within the bottom substratum of a body
of water, especially within the bottom-most oceanic sediments, rather than on
its surface. Bacteria and microalgae may also live in the interstices of bottom
sediments. In general infaunal animals become progressively smaller and less
abundant with increasing water depth and distance from shore, whereas bacteria
show more constancy in abundance, tending toward one billion cells per
milliliter of interstitial seawater.
Birds (class Aves or clade Avialae) are feathered, winged, bipedal, endothermic
(warm-blooded), egg-laying, vertebrate animals. With around 10,000 living
species, they are the most speciose class of tetrapod vertebrates.
old-fashioned speech, critter and beast denoted a large domestic animal. The
more restricted senses "a cow," "a horse," or "a mule" are still characteristic
of the speech in specific regions of the United States. The use of critter
among younger speakers almost always carries with it a jocular or informal