When a biology class dissects frogs and dosen't pith them themselves, the frogs come in a big bucket. I think there are about 30 frogs to the (big plastic) bucket, and they're packed in alcohol or formaldehyde or some other preservative that smells bad.

Alternately, a study in fun, slimy, squirmy things: in the late spring/early summer, if you live near a stream, if you're 10 or 11, if you're quick and industrious, a device to frighten the girly girls. Your shoes are full of mud, your mother rolls her eyes, you're proud and giddy, swinging that bucket between your legs, jeans wet plastered on, watching the lil'froggies dive kamikaze off the rim.