Oil gland in birds is present at the __X_ and helps in Y___. X and Y are
X Y
1. base of the wings gliding through the air
2. base of the tail water-proofing
3. base of the wings preening of the feathers
4. base of the tail excretion of the wastes

Moderate

Solution

In birds, skin is dry without glands except the oil gland at the base of the tail. The oil from each lobe of the gland is secreted through small papilla (nipple-like projection). It performs many functions in the bird including water-proofing, and keeping the skin, feathers and bill supple. The oil is said to have some antibacterial function.

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