Some finches do fly south in winter, such as the Goldfinch, and Purple Finch. Pine Siskins move south in the winter, as do Evening and Pine Grosbeaks. Note: There is not total agreement on the migration of Goldfinches as a regular winter pattern, but they will definitely move south in winter as food supplies are depleted. Goldfinches in the northernmost areas of their range do withdraw southward in winter. Source; Peterson Field Guide to the Birds.
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Most domesticated zebra finches are timid and fly away from humans who approach them. They CAN bite, though. It has known to be quite painful according to the sharp beak. I have zebra finches and none of them have bitten me before.
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.