butter clams
... that otters and seabirds seem to be able to detect when butter clams are toxic, but humans cannot?
... that otters and seabirds seem to be able to detect when <b id="mw5g"><a href="./Saxidomus_gigantea" id="mw5w" rel="mw:WikiLink" title="Saxidomus gigantea">butter clams</a></b> are toxic, but humans cannot?