Well if you are ready to take care of it(A GREAT RESPONSIBILITY)instead of chasing it away nurture it,or else just chase them away if you think you aren't up to it.
If you are referring to a physical shelter, it could be a nest, or bird house. If you are referring to a shelter wear they are protected, it could be a reserve.
The name of a pigeon shelter is called a bird house.
a bird survieved by getting shelter,food,water
A nest
An animal shelter
it is made of mulch and straw.
Dodo Bird
When a bird shelters in a tree, it is a form of commensalism. This is where the bird benefits but the tree is unaffected.
Homes
Fish!
It means a tired bird took shelter on your front porch and fell asleep. that's all.
food,shelter,water,air,sunlight