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, (10[1])ears, and nose, and shakes its snout back and forth to sense prey using its 40,000 electroreceptors. (10[1])This animal’s crural glands produce (10[1]-5[1])venom that is injected by spurs on its hind (10[1])limbs. (10[1])This animal practices knuckle-walking to protect the webbing on its feet. This sole member of the genus 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 mammal often (10[1])described as “duck-billed.” ■END■

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