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The young emerge from an egg almost the size of a chicken egg . The Department of Ornithology and Mammalogy was established in 1853 with the creation of the California Academy of Sciences . Look at the mouth-parts of a grazing snail through a lens and you can see how it presses its mouth against the glass pane , opens its lips , and lets the radula glide over the algal film . Enraptured by the idea of birdsong as music , he gained worldwide attention shortly before an untimely death .