Birds are bipedal vertebrates that evolved from theropod dinosaurs or reptiles. They are from a new class of vertebrates known as Aves which includes all birds. They have feathers and wings. The main function of their feathers is to maintain body temperature and their wings are used for flight. To maintain balance, birds placed their body in the center of the earth so it can be over and between their feet. When landing, they come closer to the ground and slowly rises to minimize the impact.
Most birds are arboreal, in other words, tree-dwelling species. They grip on tree branches to keep their body upright and to prevent them from falling. Birds do not have claws, but instead, they have 3 digits or toes that they used to climb up trees. They also don't have teeth but instead, they have gizzards that help them digest hard nuts shell, seeds, and insects. Birds are the only species of its kind to reproduce externally. Most birds provide parental care until the eggs hatch after that the babies are on their own. They use their acute senses to help them navigate and communicate, also, they can hear sounds and see a wide range of colors more than humans. Their brain is about six to eleven time larger than reptiles and has lateralization that resembles primate brain.
Comments
Single paragraph
The perfect paragraph should be a single (perfect) paragraph. This looks like two paragraphs.
Ways to improve
"birds place their body in the center of Earth" ; do you mean to say that birds place their center of gravity relative to the center of Earth? I am very confused here.
You use "but instead" a lot, I don't think you need to even use the first parts of those sentences. They just seem like fillers to make the paragraph longer. You can combine some sentences into one, like "Birds are the only species of its kind to reproduce externally, and most birds provide parental care until the eggs hatch, after that the babies are on their own." Also the original punctuation here needs to be looked at. I bolded the changes I believe could be made.
Suggestions
In writing, I do not think you should use words like "don't. " It should be written as "do not" short cutting words are not formal in writing. Also, to combine the sentence and to make the paragraph more simple, you can eliminate extra wording such as "which includes all birds." Since you are talking about birds and you have other explanations about them, you do not have to write obvious facts.
comment
This is written well but some sentences are a little short. There could be more detail given in each senstence to support thr facts that you are stating.