Body: "Birds" is the examination of the key concepts in evolution, behaviour and ecology such as the definition of species, the process of speciation, instinct, learning, ecological niches, guilds, island biogeography, phylogeography, and conservation.
Some questions in "Birds" involve species distribution, extinction, evolution, predator-prey relationships.
better understand the evolution and behavior of birds is some of the cause to investigate "Birds".
Mary C. McKitrick, Robert M. Zink, Frank B. Gill are some authorities of "Birds".