"Why, they are the ends of its legs, and there is a long slim part
beyond the feathers, hard and horny like the beak, and at the end of
this are four toes, three in front and one behind, and they've all sharp
claws on their ends."

"Very well said, my boy! Now I will show you that such feet as the
Sparrow has are as much like Dodo's as a Sparrow's beak is like her
mouth. Begin with the claws--"

[Illustration: FIG. 1. Insect-eating bill of Robin; 2. Seed-crushing
bill of a Sparrow; 3. Snapping bill of Whip-poor-will; 4. Needle bill of
Hummingbird; 5. Chiselling bill of Woodpecker; 6. Climbing bill of
Paroquet; 7. Tearing bill of Falcon; 8. Grooved drinking bill of Dove;
9. Gleaning bill of Ruffed Grouse; 10. Wedge bill of Plover; 11.
Straight probing bill of Snipe.]

[Illustration: FIG 12: Curved probing bill of Curlew; 13. Spearing bill
of Green Heron; 14. Strainer bill of Duck; 15. Hooked bill of Gull; 16.
Ornamental bill of male Puffin in breeding season.]

"I know!" exclaimed Dodo, "toe-nails! Only I think they need cutting!"

"Of course they are toe-nails," said the Doctor. "Don't nails grow on
the ends of toes? All kinds of claws, on the ends of birds' and other
animals' toes, are the same as nails. Some are long, sharp, and curved,
like a cat's or a Sparrow's, and some are flat and blunt, like ours. I
could show you some birds with claws that look just like our
finger-nails. Toes, too, are pretty much the same; only this Sparrow,
like most other birds, has but four, with three of them in a line in