We cracked open America's favorite crustacean, Homarus americanus, to plate the delicious facts hiding inside. Irina Kulikova/iStock via Getty Images PlusTypically, lobsters are a mottled brown, but genetic mutations can create red, blue, calico, and even albino lobsters. cynoclub/iStock via Getty Images PlusThese fin-like structures help lobsters circulate water inside their shelters; females also use them to carry eggs. Female lobsters hold on to semen for many months. When a fisherman traps a female lobster carrying eggs, he puts a V-notch in her tail.