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 forth (-5[1])to sense prey using its 40,000 electroreceptors. (10[1]-5[2])This animal’s crural glands produce venom that is injected by spurs (10[2])on its (10[1])hind limbs. (10[5])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, (10[1])its monotreme (10[1])relative. For 10 points, name this semiaquatic, egg-laying mammal often described as “duck-billed.” ■END■ (10[1])