That isn't really what they are doing. It is a lazy way to watch a hunting area without all the fuss and bother of flying. If they spot a mouse or ground squirrel, they'll leave their perch and attack.
The are safe in trees but the do not just stay in trees - they have wings and can and do fly around.
heck no
Put barbs on your tree. Chop your tree down! ;]
because of their sharp claws and strong feet
there were no birds in the tree because all the birds flew away after hearing the loud sound
birds (subject)tree (object of the preposition in)
No.
Many birds make their nest on a tree such as a Woodpecker, Nuthatch and a Tree Creeper.
Birds that hang on to trees!
No. A tree sparrow eats seeds.
in a tree
There are four birds left
depends on how big the tree is....
in a tree