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Show Why Birds Live Long. Why do birds llvo so much longer than mammals, which are often a hun-dttd hun-dttd times their sIzoT Possibly, among other things, becauso they havo beaks Instead of teeth. All carnivorous beasts become weak and llablo to starvation, star-vation, as their teeth drop out or break. Neither aro tho herbivorous animals In much hotter caso. Old horses would probably dlo of starvation starva-tion If wild, for their teoth would fall them, Indeed, In somo stony countries old horses havo to bo killed bocauso their teeth or, worn awny by cropping grass closo to the rock. Rodents constantly con-stantly dlo from injuries to teeth. But a bird's benk itcltncr wears out nor drops off. nnd as It constantly swallows swal-lows fresh grit to aid In grinding fond in tho gizzard thnt needs no ropalrlng clthor. |