The Most Amazing Birds🐧🐧🐧

Birds belong to the group of vertebrate animals and are a species that has wings that mostly allow them to fly , although there are also some non - flying birds . In general , birds fly , jump , walk or swim with incredible speed and agility . Just as incredible is what happens in the breeding season . For centuries , the courtship of these species has amazed the human being . The size of the birds varies from one species to another , they can measure from 6.4 cm in the case of a small hummingbird , to about 2.74 meters in the ostrich , the largest bird in the world . Birds have horny beaks and do not have teeth . They are warm - blooded , can walk , jump , and stand only on the hind limbs . Their forelimbs are reshaped with wings , which allow them , in most birds , to fly . Flying is the main means of movement for most birds and they also use it to reproduce , feed themselves , and flee from their predators . However , about 60 species of birds are flightless , these are often found on isolated islands , probably due to a scarcity of resources and the absence of land predators . Communication between birds is versatile and can involve sensory signals , calls , and songs . Some make a great variety of sounds and calls . The diet of birds includes a large amount of food such as nectar , fruits , plants , seeds , carrion , and various small animals , including other birds . However , the diet varies according to the species . Birds inhabit all land areas and in all the world's oceans . They are even found in the Antarctic region . Birds generally migrate to take advantage of seasonal temperature differences around the world . Migrations vary greatly by gender.