Aves are birds. In birds forelimbs are modified into wings.

1. Dr. BGR

2. • Introduction
• Key Characteristics
• General Characteristics
• Example
• Summary

3. • Kingdom: Animalia
Note
All animals are members of the Animalia
• PHYLUM: CHORDATA
• SUBPHYLUM: VERTEBRATA
Chordate: animal of the phylum Chordata

4. animals
Cold Blooded
Cannot maintain
Constant
temperature
Warm-Blooded
Can maintain
Constant
temperature

5. forelimbs are modified into
wings
Wings: இறக்கைைள்
Forelimbs: foreleg
Note

6. adapted for walking, hopping,
perching, grasping, wading &
swimming
Hopping: துள்ளல்
Perching: rest on something
Grasping: பிடிப்பது
Wading: walk with effort through water / another liquid
Note

7. epidermal scales on their legs
Scales: composed of keratin
Note

8. bones filled with air cavities

9. spindle-shaped
(OR)
boat-shaped
(OR)
streamlined
Why do birds have streamlined body?

10.  help in preventing heat loss
 reduce air friction

11.  no skin gland
 oil gland: present
Note
uropygial gland / preen gland / oil gland

12. jaws are modified into a
beak

13. Absent

14.  It has a crop & a gizzard
 crops used in softening food
 gizzard helps in crushing the
food

15. spongy & elastic lungs

16.  special vocal organ
 present at the base of
trachea

17. four-chambered

18.  oval
 nucleated
 biconvex

19. single ovary & oviduct on
the left side

20.  exhibit sexual dimorphism
 eggs have four embryonic membranes-
amnion, chorion, allantois, & yolk sac
Note no other embryonic development within the mother

21. Monocular

22. • Pigeon
• Parrot
• Sparrow
• Owls
• Penguins
• Hummingbird
• Crow
• Ostrich

23. drbgrpublications@gmail.com
https://drbgrpublications.in/