House finches are small and have a reddish color head and neck. They are wild birds.
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What kinds of sounds are you referring to? House finches sing to attract mates, to communicate with other finches, and maybe even sometimes because they are happy. I've also seen them hiss at intruders.
Charles Darwin discover the finches in Galapagos in 1831. He noticed that the finches beaks were different compared to the finch's in Ecuador.
All known species of Darwin's Finches are found on the Galápagos islands. With the exception of one, the Cocos Finch, which is found on the Cocos Island. Darwin's finches are not actually true finches. Darwin knew they weren't finches, but an ornithologist called Percy Lowe, later in 1936 incorrectly called them "Darwin's Finches" in a book, a term which unfortunately stuck.
Well.. from my experiences with finches - they like holly tree's, and rhododendrons.
Peter and Rosemary Grant chose to study the Finches in the Galapagos because they were hybrid.