Monarch butterflies have magnitite (a mineral) inside their heads and this helps them determine 'North', just like a magnet.
Balmy Arctic
Balmy Arctic Researchers in the Canadian Arctic have found
fossil evidence that global warming also happened 90 million years
ago. Bones of Champosaurs (crocodile-like dinosaurs) and other
fossils show that millions of years ago the Arctic was warm. This
warmth was probably due to seismic activity, like volcanos
erupting, that released large amounts of carbon dioxide into the
air and warmed the Earth.
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