I use a bunch of strings knotted together to give birds something else to peck on. Many pet shops sell a "bird tranquilizer" which has fibers sticking out of a wooden bead. The strings work just as well.
They probably don't like being caged.
I did a little bit of research and I'm just getting that zebra finches do well with other zebra finches; not any other kind. Hope this helps, although I do have two zebra finches that continuously peck at one another. So it may be a sign of playing? Keep a close eye on them and make sure they don't hurt each other.
i know mine too strange
Cockatiels preen each other. This may appear as though thy are pecking at each other's heads.
Most of a chickens life consists of arguments of "who is better than who" in the pecking order.
two kinds (for each size) are: (small) budgie, finch (medium) conure, dove (large) cockatoo, amazon
Chickens peck at each other to establish who has dominance over the other. It is called the pecking order. Sick or injured birds offer changes to the established order and their place on the flock hierarchy. The aggression by the other chickens is showing they are moving up at the expense of the weaker bird.
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
Because they are molting or they are at the bottom of the pecking order and I would take them out of the flock but then after they return the flock will treat it badly and the pecking order will change and it might be messy.
Some birds do eat other birds: raptors are meat-eating birds and often raid nests and take chicks to feed their young birds.
The Galapagos Islands. Charles Darwin discovered that the birds on the island, finches, had different beaks. The finch's beak varies from each island to help the finch eat the food they can find on the island