Question

characteristics that are peculiar to aves​

Answer 1

Answer:

Characteristics peculiar to Aves:

• Birds are warm-blooded animals.

• Their forelimbs are modified into wings.

• They have well-developed flight muscles that help during the flight.

• Their hind limbs are adapted for walking, hopping, perching, grasping, wading and swimming.

• There are epidermal scales on their legs.

• The endoskeleton is bony with long hollow bones filled with air cavities. known as pneumatic bones.

• Their spindle-shaped body minimizes resistance of the wind.

• The feathers help in preventing heat loss and reduce air friction by providing passage to the air.

• There is no skin gland except the oil gland.

• The lower and upper and jaws are modified into a beak.

• They have no teeth.

• They have sharp eyesight.

• The alimentary canal has a crop and a gizzard. The crops help in softening food, and the gizzard helps in crushing the food.

• Pigeons and other seed-eating birds lack a gall bladder.

• They have spongy and elastic lungs for respiration.

• The special vocal organ called syrinx is present at the base of trachea.

• Their heart is four-chambered.

• RBCs are oval, nucleated and biconvex.

• 12 pairs of cranial nerves are present.

• They have a single ovary and oviduct on the left side

• All the birds are oviparous and exhibit sexual dimorphism. The eggs have four embryonic membranes- amnion, chorion,  allantois, and yolk sac.

Explanation:

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