What type of feeder is a sponge?

Their is one goose in the river behind your home that stays there all alone. He doesn't appear sick but doesn't hang with the other geese. My husband does feed him a little but why is he a loner? What are hawks population? Who collects wild birds eggs? What is cuprite used for today? Do all alinens like sqirrels? What is means to get pooped by a bird? What do desert vultures eat? What do peacocks do all day? What colour are a kingfishers legs? What is the relationship between biological magnification and the reduction of the bald eagle population by pesticide DDT? What do you say the bird crane in Hindi? What does the proverb 'Feather by feather the goose is plucked' mean? Are birds bad for the environment? Do sparrows kill bluebirds? What is a turkey neck made of? How do you take out dark mark from legs please help me? Is howard the duck good or bad? What bird has black and brown fur and a long neck? Are Crows Legal As Pets In Australia? What can you do to help macaws?