The frogs were all wrong. Located in a small pond in Henderson, Minn., the amphibians discovered by a middle school class had legs growing out of legs, missing eyes, bent spines and contorted jaws.

HENDERSON, Minn. — Seventeen years ago next month, school children made a gruesome discovery in south-central Minnesota. In the Ney Pond, an ordinary pond surrounded by cornfields and woods near ...

HENDERSON — Thirty years ago, the discovery of deformed frogs at a small pond — in what is now part of the Ney Nature Center — turned Minnesota New Country School students into citizen scientists.