Round 1: Tossup 6

This animal’s young develop vestigial teeth that are later lost in adults, who instead use heavily keratinized pads to grind food. While hunting, this animal closes its eyes, ears, and nose, and shakes its snout back and (10[1])forth to sense prey using its 40,000 (10[1])electroreceptors. (10[1]-5[2])This animal’s crural glands produce venom that (10[1])is injected by spurs on its hind limbs. This animal practices (10[1])knuckle-walking to protect the webbing (-5[1])on its feet. This sole member of the genus (10[1])Ornithorhynchus (“OR-nith-oh-RING-kiss”) lacks teats and delivers milk through its pores, like the echidna, its monotreme relative. For 10 points, name this semiaquatic, egg-laying (0[1])mammal often described as “duck-billed.” (10[2])■END■

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