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.
Zoologists and paleontologists use fauna to refer to a typical collection of animals found in a specific time or place, e.g. the "Sonoran Desert fauna" or the "Burgess Shale fauna".
Paleontologists sometimes refer to a sequence of faunal stages, which is a series of rocks all containing similar fossils.
A rooster (also called a cockerel or cock) is a male gallinaceous bird. It usually refers to a male chicken (Gallus gallus).
Immature male chickens less than one year old are called cockerels. The term "rooster" originates in the United States, and the term is widely used throughout North America, as well as Australia and New Zealand. In the United Kingdom and Ireland the older term "cockerel" is more commonly used.
"Cock" is in general use as the name for a male of other species of bird, for example "Cock sparrow". "Roosting" is the action of perching aloft to sleep at night, and is done by both sexes. The rooster is polygamous, but cannot guard several nests of eggs at once. He guards the general area where his hens are nesting, and will attack other roosters that enter his territory. During the daytime, he usually sits on a high perch, usually 3–5 feet off the ground to serve as a lookout for his flock. He will sound a distinctive alarm call if predators are nearby.