Mexico is one of the most biologically diverse countries in the world, its ecosystems are dominated by landscapes typical of different regions and fused to make Mexico one of the three most biologically diverse countries in the world, along with Brazil and Indonesia, which together with these and the other 10 countries which together hold about 70% of all varieties of plants, animals and soil microorganisms, have been called megadiverse countries. The diverse flora and fauna of Mexico is composed of more than 25,000 species of plants, 530 000 species of mammals, 1100 species of reptiles and amphibians, and 1,070 species of birds, also ranks first in diversity of reptiles and amphibians, mammals third and fourth floors. Actually Mexico maintains 10% of the world's diversity, a fascinating fact considering that only has 1% of the land surface of the planet.

Of all the terrestrial vertebrates that exist today, the birds are one of the biggest groups that inhabit virtually all ecosystems of our planet, are adapted perfectly to life in the air, water and land as well as rigorous environments such as some deserts and permafrost. This group of organisms is an important resource for social and cultural development of nations.

The ecological services provided as seed dispersers, seeds to be swallowed by birds, these are deposited in places where they can germinate and in other cases the seeds must pass through the stomach of birds to break the outer layer the covers and begin germination. An example of the above are the parrots that feed on fruits or seeds in a different place to they're stayed to sleep, transporting of this way the seeds to the other locations or as toucans that feed mainly fruit when they're flying released to defecate. Also recognizes it? importance as pest controllers, from small insects to mice. The flycatchers and nightjars, who have a kind of whiskers called vibrissae, which serve to trap flying insects and thereby feed. Besides that some species of warblers feed on larvae of pests that attack crops so they serve as natural pesticides. the woodpeckers habits of wooden cutting or drilling has allowed drivers also serve as insect pests that feed on wood and are harmful to forests. Their beaks straight, strong and long tongue thrusting facilitates drilling and extracting them from the trunks larvae damaging the wood. Some birds like the hummingbirds when they're feed on nectar flowers are impregnated with pollen who leads from one flower to another pollinating a lot of flowers.

The scavengers like vultures have a cleaning job because consume decaying animals and some individuals sick maintaining ecosystem health, preventing disease occurrence. It is well known that some species of birds are used to determine the status of health that keep some ecosystems, so they're said to be indicators of environmental quality such as the canary that miners used to know the air quality within mines.