Heart is four-chambered consisting of the auricles and two ventricles
Hind-limbs are modified as wings
Mouth is replaced by beak
Aves are warm blooded
B. Hind-limbs are modified as wings
Asia
Africa
America
Antarctica
Serpentology
Entomology
Ornithology
Dendrology
ostrich
albatros
penguin
elephant bird
swan
falcon
penguin
eagle
Ostrich
Penguin
Emu
Albatros
New Zealand
India
Japan
Australia
instinct
instinct and intuition
instinct and intelligence
both and
sharp massive, deeply hooked
stout and acute
chisel sfiaped
long, strong and pointed
Pectoralis major
Pectoralis minor
Intrinsic muscle
None of these
faecal matter
nitrogenous wastes
excess salt
both and
middle of the trachea
at the base of trachea where it divides into bronchi
base of tongue
none of these
larynx
syrinx
synsacrum
pygostyle
Crow
Koel
Peacock
Ostrich
grain-eating birds
meat-eating birds
fruit-eating birds
insect-eating birds
crow, sun-bird, flower pecker
myna, peacock, parrot
weaver bird, sun-bird, flower pecker
all of these
csursorial
perching
wading
raptorial
ectoderm
mesoderm
endoderm
skin
heterocoelous
acoelous
opisthocoelous
amphicoelous
three toes
four toes
five toes
any of these
bill
pecten
keel
filoplume
Albatros
Hummingbird
Elephant bird
Penguin
Pavo cristatus
Gallus gallus
Columbia livia
None of these
sharp eyesight
keen smelling power
both and
sharp eyesight and poor smelling power
day light effecting the endocrine glands
search for food
search for shelter
purpose of breeding
Tail only
Wings only
both and
beneath the contour feathers.
parrot
peacock
kiwi
pigeon
perching type
wading type
raptorial type
running type
Quill
Filoplume
Down feather
All of these
monocondylic
dicondylic
amphicondylie
none of these
a mammal
a reptile
abrid
none of these