Go ahead! Stretch your e-magination and test yourself. Click on the right answer and get the full scoop. Get it wrong—try again. You’re looking at its underbelly. The head’s on top.   It’s doing an imitation of a Martian spaceship.   It hides its head when predators approach.   It’s a reflection on the water. Thumbs down! That’s not the best way to escape if you don’t have a hard shell. Why does this Arctic creature have four legs and no head? Photograph by Bates Littlehales

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