1) Yes, bird food can become rotten. It can clump up, become moldy, become infected with insects or rodents, sprout shoots or roots, and/or smell bad. If the food becomes too old, it loses nutritional value and birds may not find it appetizing.
1)
Kitchen scraps are generally fed to larger birds
such as ducks and gulls. Because birds who eat from birdfeeders are generally
much smaller, you should tear the food scraps into very small pieces so they
can fit into very small beaks. Monitor the birdfeeder after a couple of days,
and if the food is still there, it means the birds don't like it.
1)
Different
birds like different kinds of seeds. For example, almost all birds enjoy
sunflower seeds. Other popular seeds include safflower, corn, Millet, Milo,
Nyjer and Suet. If you know of a certain species of bird that lives near you,
you can check the chart on this website to see what seeds that bird enjoys.
http://www.birds.cornell.edu/pfw/AboutBirdsandFeeding/BirdFoods.htm
I don't know what type of birds you have but you should know
that Live foods are very beneficial to birds. If you think about it, that's
part of their diet in the wild. Live foods are important sources of protein for
young birds as well as attractive and nutritious.
Basically, I would mix grains and straight food with live food for their diet.
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