Bird It is a term that comes from the Latin word avis. The concept is used to refer to a animal oviparous Y vertebrate whose body is protected by a plumage and that it has a pair of wings generally fit to fly.
It is important to mention that the notion of birds, in the plural, is used as a taxon. Therefore, it refers to a subdivision in the framework of the classification of animals carried out by the biology.
The evolution of birds
It is estimated that birds arose about two hundred million years ago, in the Jurassic period of the Mesozoic era. In fact, these beings are usually classified as dinosaurs theropods that managed to survive despite the mass extinction that took place about 66 million years ago.
The fossils demonstrate that the evolution of modern birds occurred from ancient theropods. Various experts, in this framework, even maintain that birds are indeed dinosaurs, including them as a subgroup in this set.
Birds are oviparous: their embryos develop in eggs. They are vertebrate species (they have spine) who breathe through lungs and they keep their blood at a stable temperature.
A peak horny in nature, two wings and two legs are also part of the body characteristics of these species. Their bones they are hollow but resistant, which facilitates flight in most birds since their bone structure is light.
The plumage, which molt regularly, is very important for all birds. Thanks to the feathers they can be identified, camouflaged and regulate body temperature, for example. It is possible to differentiate between various types of feathers, such as flight feathers (which help thrust and lift) and the markers (which provide thermal insulation).
Although the characteristics mentioned are common to all birds, there are many species and, therefore, these creatures show very varied properties and traits.
The ostrich, of scientific name Struthio camelus, is the largest bird in the world: its weight can be around 180 kilograms, while its height can reach 3 meters. This bird cannot fly, but it runs at high speed.
At the other extreme, hummingbirds or hummingbirds they are the smallest bird species. The call hummingbird zunzuncito (Mellisuga helenae), which is found in Cuban territory, is the smallest, measuring just 6 centimeters in length and weighing less than 2 grams.
The canaries, the hawks, the Eagles, the toucans, the parrots, the pigeons, the penguins, the chickens, the owls, the rhea, the seagulls, the crows and the flamingos they are also birds. It should be noted that the word bird to refer generically to birds, especially when they are small in size.
Food and behavior
As we already indicated, there are numerous species of birds with different characteristics. Among the foods that these animals can eat we find insects, sheets, seeds, fruits Y carrion, depending on the type of bird.
Many species are migratory and move seasonally to facilitate access to food and facilitate reproduction. Some birds are solitary, while others reside in small groups or form flocks of numerous members.
Birds communicate through sounds and visual signals. In some cases, your intelligence allows them to use objects such as tools or utensils.