Pam Prather, age 12, of Louisville, Kentucky, for her question:

How is the duckbill_platypus poisonous?

The furry female is not poisonous. In fact she has no way at all to defend herself. But the male platypus can survive a scrap and even deal a mortal blow to his foe. Each of his back feet is armed with a spur, like a very sharp claw. The base is attached to a gland that manufacturers a poisonous substance. When Mr. Duckbill is attacked, he scratches and claws with his back feet. And the poison enters the open wounds.

These animals are among the earth's most shy creatures. They prefer to live peaceably and keep out of sight. During her long incubating period, the female even seals herself alone in her burrow. The male seems to be a somewhat more venturesome character. When captured, he fights with all his might and his poisonous claws tear dangerous wounds.