Any mammal with an even number of toes on each foot, including deer, pigs, cattle, camels, and whales.
From Greek artios ('even') and daktylos ('finger' or 'toe'). The term was coined to classify mammals whose weight is distributed equally between two main toes.
Whales and dolphins are actually artiodactyls—their flippers contain the same bone structure as hoofed animals, which is how scientists proved whales evolved from land mammals that walked on even-toed hooves!
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