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
Here is 3
Hollow Wings
Vertebrate
Air Sacks in lungs
Birds have beaks instead of teeth. They also have feathers on their wings to help them fly.
They are warm-blooded, covered in feathers, have wings, lay eggs with hard shells, and they are vertebrates.
most birds have four toes but some dont
four birds are vulture, cardinal, raven and crow
four chambered hearts are seen in birds and animals.but it is thought that four chambered hearts of birds evolved independently from that of mammels. -A.NITHIN SANTHOSH
Fundamental characteristics that frogs and birds share include that they feed on other organisms and they move. Frogs and birds are vertebrates and they are multicellular.
more bowling smerds
Birds have many characteristics, but all birds share four specific traits. Four chambered heart, hollow bones, diapsid skull, reversed toes, and a fused collarbone are traits that all birds share.
Birds.
Good,Responsible,Lovable,Generous
list all of the characteristics of a geologic formation?
Birds are warm-blooded.
they poo
they are birds
birds
A "state" (nation-state) has Population, Territory, Soverignty, and Government.
Yes airplane have the characteristics of life. The have wings like birds.
most birds have four toes but some dont
Birds have four chamber heart!