Birds

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by egonzalo
Last updated 4 years ago

Discipline:
Science
Subject:
Animals
Grade:
1,2,3,4,5,6,7,8

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Birds

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Birds are terrestrial endothermic vertebrates.This means that they can maintain their body temperature independtly of they eviroment.

Birds

Female

Male

Birds use sexual reproduction and have internal fertilisation.For fertilisation,two indivduals put their clocaca together.the cloaca is a opening in the posteriorr of the body for the reproductive,digestive and escletory sistems.All birds are oviparous and lay amnioti cggs.The parents incubate the eggs to maintain them at the right temperature.Many birds look afterr their young after they hatch.

Nutrition

They are endothermic animals, they can live in any tipe of climates. Some birds migrate to escape low or high temperatures. The characteristics that differentiate them vertebrate groups are are:-Bird's are adapted for flight. They have a fusiform, aerodinamic body.-The body is covered with feathers, except for the legs, that have scales.-The upper limb are wings. Birds also have some hollow bones to make the animal lighter and facillitate flight.-The eyes and ears highly developed. Many birds have their eyes on the sides of their hair, in a lateral position, allowing a wide field of vision.

Reproduction

description

the feeding habits of birds are very varied.The mouth has a beak and no teeth.the sape and size of the beak is directly related to their eaten habits.Birds do not to chew food; they store and soften it in part of the oesophagust called the crop.In the stomach there is a very muscular area, the gizzard, wich helps to grind the food.they breathe with lungs wich are connected to the air sacs. This increase their pulmonary capacity and the amount of oxygen take in.

María GascónLucía GraciaNaiara CéspedesEva Otal1E4


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