A crab (the crustacean); commonly eaten or observed sea/freshwater animal.
冬になるとカニを食べに北海道へ行く人が多い。
Many people go to Hokkaido in winter to eat crab.
浜辺で小さなカニがたくさん歩いていた。
Many small crabs were walking along the shore.
蟹（かに）の甲羅をきれいに洗ってから調理する。
Wash the crab's shell clean before cooking.