large
humming bird A hummingbird may be the smallest bird, but the question includes and I quote: "who's nest is double the size of football". That bird could be a couple different ones, but it is going to be somewhere around the size of a large woodpecker or smaller bird of prey.
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A bird that looks like a pigeon but is larger in size is called a dove.
That bird is called a western goldfinch.
it depends on what type of bird you are talkiing about what type of bird it is a normal bird is 10inches but it veries
humming bird
Depends on the type and size of the bird.
It depends on the size of the bird and turtle.
Usually quite small, but it depends on the size of the bird. It can be from the size of a dime
1
20 feet
( 1.) The bird's success in driving off his rivals. ( 2. ) The size of territory the bird needs and ( 3. ) How much food is available.