In different areas, bird species are eaten by different kinds of introduced species. Small Flightless Birds like the kiwi are especially vulnerable because they have no adaptations to escape predation. Some introduced species that kill birds include domestic dogs, snakes, and domestic cats. Rats sometimes eat the bird eggs, too.
many
Yes. Gulls, (not "seagulls") will eat anything edible, and will take unprotected baby birds of other species.
Some birds do eat their own feces for a second round of digestion, but this is only in a certain minority of birds (such as some owl species).
Some birds might eat grass, but it depends on the species. Most birds eat grubs, berries, seeds, and other vegetation.
Birds eat a variety of foods based on their species. Some eat worms, grubs, small insects, seeds, nuts, or berries.
several species of birds eat several species of fungi
That is the way birds eat rice in nature, since very few of them know how to cook.
A cardinal bird does not really have a job with its species. They are meant to eat, breed, and raise new generations of cardinal birds.
yes depending on species
yes they eat insects and wormsMost birds of any size will eat insects.
Some birds do, particularly some insectivore bird species.
Falcons eat small birds and rodents . that's all i know ^_^