You can't force it. If they don't get along, they don't get along. :)
Yes, birds of prey like falcons and eagles.
Birds tend to not like each other, especially if they are the same type of bird.
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.
Penguins breed by mating and copulating, like other birds.
Because birds like to mimic each other or things(like humans) that is why parrots can talk.
They probably don't like being caged.
it depends what type of bird it is birds use there talons for different thing like climbing tree's.
sometimes they are. territory.
yes, jaguars each other. only if they can not find any pray like Deer,birds,fishes armadillo,tapirs and more.
Because their wings arnt like other birds.
Are they old enough? Is their cage big enough and have a place for a nest? They have to want to, maybe they don't like each other. Do they groom each other? Birds are a lot more particular than dogs and cats.