Question

Write down the characteristics of class Aves? Also give the different groups? 

Answer 1

Characteristics: -

i) Members of these groups are called birds.

ii) The organisms in this group are very beautiful and have melodious voices.

iii) There are more than 9000 species are present of birds.

iv) They are found in forests, deserts, and on mountains.

v) Some birds live in the dark caves.

vi) The forelimbs are in the shape of wings.

vii) Hind limbs held in walking

viii) All the birds have horny beaks.

ix) All the birds lay eggs.

x) All the birds must have two wings.

xi) Their digestive system is able to digest thigh caloric food.

xii) They have high blood pressure and high metabolic rate.

xiii) Eyesight is well developed.

xiv) Nervous system is also well developed. 

Groups of birds: -

Birds are divided into two groups.

Running Birds: - (Ratitae)

Running birds have flattened sternums and their pectoral muscles are less

strong e.g. Ostrich, Emu, Rhea, Cassowary etc. Ostrich is the larges bird. It can

run 42-70 km/h.

Flying Birds: - (Carinatae)

Pectoral muscles are very strong and powerful. This helps them to fly. Their

common examples are pigeon, crow, kite etc. Humming bird is smallest in the

world. Its size is two inches long.