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What are the main morphological features of birds?

Aves, or birds, are animals that present aerodynamic bodies covered with feathers, anterior limbs transformed into wings, pneumatic bones and horny (corneous) beaks.

In which habitat do birds live?

Birds are terrestrial animals but the majority of species also explore the aerial environment by flying.

What are flight adaptations present by birds?

Wings associated to a well-developed pectoral musculature, pneumatic bones, less accumulation of feces in the bowels due to the absence of the colon, absence of the bladder (no urine storage), aerodynamic body and lungs with specialized air sacs are all adaptations of birds to fly.