Page 3 - 3.Home assignment II(Expt&Activity)
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4. BIRD-----It belongs to phylum Chordata, sub phylum Vertebrata and class Aves.
Features of Phylum Chordata
1. They have notochord.
2. They have post anal tail.
Features of Class Aves
1. Their forelimbs are modified into wings.
2. They have beak.
3. They are oviparous.
Specimen Features
1. They have streamlined body to provide minimum resistance to air current and
help in flying.
2. They have feathers on the body which provide insulation.
3. Birds have air cavities in their bones (pneumatic bones) which reduce the
weight of the body and help in flying.
4. Their eyes are covered with nictitating membrane.
