sometimes they are. territory.
no one can get a hold of each other
the birds are just calling to each other to see where they are i think.
Yes many birds in the wild life eat each other
Some birds do eat other birds: raptors are meat-eating birds and often raid nests and take chicks to feed their young birds.
Because birds understand each other better because they are the same species. It's a bit like cats and dogs. They don't understand each other but cats do understand other cats.
how a telephone benefits life is that it helps people communicate to each other and not by just bothering to go to other peoples homes and talking to them. It is just a faster way to talk to each other.
Yes, birds of prey like falcons and eagles.
Birds as a Specie have compared to humans incredibly fast reflexes. So as it appears two are going to collide they actually know perfectly well of what is happening and have plenty of time to turn away from each other :)
Birds tend to not like each other, especially if they are the same type of bird.
New birds have been produced, and difrent species mate with each other which makes a new type of bird. Some birds who mate with each other produce offsprings with dirffrent traits, size, or color.
No, but many understand each others alarm calls.
whales use echolocation to find each other and birds... i think to attract mates.