Cats, snakes, accipiter hawks.

The grosbeaks are related to finches and sparrows, New world seed eaters. The grosbeak species are the rose breasted, blue, black headed, and evening grosbeaks. The cardinal is also a grosbeak, as is the pine grosbeak of northern climes.

Cardinals are in the family Fringilidae, which includes finches and sparrows, New World seedeaters. Their closest relatives are the rose breasted grosbeak, evening grosbeak, and blue grosbeak, and the pyrrhuloxia, a gray cardinal like bird of the southwestern U.S.

There are too many to list, but some common ones are:

Goldfinch

House finch

Purple finch

Pine grosbeak

Evening grosbeak

Common redpoll

Hoary redpoll

Cardinal

Rose breasted grosbeak

Indigo bunting

Painted bunting

Black headed grosbeak

Pine siskin

Bullfinch

Cassin's finch

fruits, seeds, insects, etc.

Depends on which grosbeak-- Evening or Black-headed or Rose-breasted Grosbeak...

All grosbeaks are seed eaters basically, but will take some berries and insects. The blue grosbeak is the only one in the family that may take insects more than seeds or berries.