heterocoelous
acoelous
opisthocoelous
amphicoelous
perching type
wading type
raptorial type
running type
instinct
instinct and intuition
instinct and intelligence
both and
peacock
emu
penguin
ostrich
swan
falcon
penguin
eagle
syrinx
larynx
synsacrum
synzygy
a flightless bird
first digit of hindlimb
a type of corn
none of these
fly for long distance
protect against ectoparasites
exhibit secondary sexual dimorphism
keep the body warm
Asia
Africa
America
Antarctica
Crow
Koel
Peacock
Ostrich
ostrich
albatros
penguin
elephant bird
Ostrich
Emu
Archaeopteryx
Pelican
Pavo cristatus
Gallus gallus
Columbia livia
None of these
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
two occipital condyles
one occipital condyle
many occipital condyles
any of these
faecal matter
nitrogenous wastes
excess salt
both and
Bernhard Katz
Alick Isacs
Charles Darwin
Andreas Wagner
a mammal
a reptile
abrid
none of these
Albatros
Hummingbird
Elephant bird
Penguin
middle of the trachea
at the base of trachea where it divides into bronchi
base of tongue
none of these
csursorial
perching
wading
raptorial
parrot
peacock
kiwi
pigeon
Ostrich
Penguin
Emu
Albatros
Serpentology
Entomology
Ornithology
Dendrology
grain-eating birds
meat-eating birds
fruit-eating birds
insect-eating birds
calcareous
soft and solid
strong and solid
pneumatic
mammals
reptiles
aves
lizards
synsacrum
sternum
pygostyle
thoracic mass
homiothermic condition and viviparity
horny jaws and four-chambered heart
ossified skeleton and four-chambered heart
bipedal locomotion and body covered with feathers
sharp eyesight
keen smelling power
both and
sharp eyesight and poor smelling power