heterocoelous
acoelous
opisthocoelous
amphicoelous
A. heterocoelous
a mammal
a reptile
abrid
none of these
instinct
instinct and intuition
instinct and intelligence
both and
mammals
reptiles
aves
lizards
middle of the trachea
at the base of trachea where it divides into bronchi
base of tongue
none of these
New Zealand
India
Japan
Australia
parrot
peacock
kiwi
pigeon
Parrot
Owl
Pigeon
Sunbird
Bernhard Katz
Alick Isacs
Charles Darwin
Andreas Wagner
Serpentology
Entomology
Ornithology
Dendrology
Asia
Africa
America
Antarctica
Ostrich
Penguin
Emu
Albatros
sharp massive, deeply hooked
stout and acute
chisel sfiaped
long, strong and pointed
Tail only
Wings only
both and
beneath the contour feathers.
calcareous
soft and solid
strong and solid
pneumatic
day light effecting the endocrine glands
search for food
search for shelter
purpose of breeding
csursorial
perching
wading
raptorial
grain-eating birds
meat-eating birds
fruit-eating birds
insect-eating birds
monocondylic
dicondylic
amphicondylie
none of these
Quill
Filoplume
Down feather
All of these
fly for long distance
protect against ectoparasites
exhibit secondary sexual dimorphism
keep the body warm
larynx
syrinx
synsacrum
pygostyle
crow, sun-bird, flower pecker
myna, peacock, parrot
weaver bird, sun-bird, flower pecker
all of these
aerial life
amphibious life
terrestrial life
aquatic life
syrinx
larynx
synsacrum
synzygy
a flightless bird
first digit of hindlimb
a type of corn
none of these
three toes
four toes
five toes
any of these
Albatros
Hummingbird
Elephant bird
Penguin
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
swan
falcon
penguin
eagle