List four characteristics of birds

Answer 1

1-feathers!
2- cranial features:
single occipital condyle
quadrate-articular jaw hinge
single ear ossicle
bill formed from premaxillary
cranial kinesis
large brain case
fusion of bones
3- reduction of skeletal weight
4- nucleated red blood cells (similar to amphibians, reptiles, and fish)
5- embryology- with egg and yolk

Answer 2

Here is 3

Hollow Wings

Vertebrate

Air Sacks in lungs

Answer 3

Birds have beaks instead of teeth. They also have feathers on their wings to help them fly.

Answer 4

They are warm-blooded, covered in feathers, have wings, lay eggs with hard shells, and they are vertebrates.