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In order to maintain the rigidness necessary for flight the birds collar bones have fused together making a "wishbone" of sorts. The rigidness and hollowness of the bones make flight easier on the bird.
They do not help cows because birds are to small and cows are to big and a bird is to tiny and cow too big for a small bird to pick up but a cow can pick up a small bird because a bird is small remember tell me how a bird can help a cow because it will not be right
birds help totises by defending it from iguanas which try to take its shell off and make it naked. The birds help to eat the iguana's and protect the tortise in return for bird money.
well all birds use them to help them land but birds of prey also use them for hunting
Yes they make the bird lighter.
the tail has flight feathers and the flight feathers help a bird to fly.
The zebra can help the bird by letting rest on it back and zebras have insects on their back so that what the birds can eat.
it is mutualism because the birds need the plant for food and the plants need the bird to help it grow
an adaptation that can help a bird survive is its beak .
The muscles in the birds body is the only thing that can let a bird fly. But oviously enough, if the wind is strong and blowing to the riht side, the wind l help
perching birds usually eat then, after 21 minutes... they poop. when they are mating, the male perching bird sticks his penis into the female bird's vigna. they may hide it with their feathers, but bird sex is really the same as human's.
The lead bird in a v-formation works the hardest. All the other birds gain a little help from the upwash from the wingtip vortices of the bird ahead of them so the lead bird is the only one without upwash. They take turns being the lead bird.