the function of a tail is to lift its body and to increase the speed of flight
The Gray African Red Tail
dove tail.
Grebes are small water birds similar to ducks. They do have a tail, but it is very short and stubby and not obvious when you look at these birds.
Yes
flight feathers
No, there was no second brain near the base of the tail. The cavity was probably a glycogen body, which are known from birds, although their function is a mystery. It may provide glycogen to the nervous system.
how are parts of birds & fish similar in structure & function
Their wings and tail
Tail sheath acts as a cell membrane to the sperm.
the tail has flight feathers and the flight feathers help a bird to fly.
A birds tail swerves its body left and right. It also has drag.
the tail of birds is really useful during their flight and hence is the 5th limb