Because ants lack noses, they use olfactory receptors on their antennae to help them find food or sniff out potential mates. For the study, published Jan. 25 in the journal Proceedings of the Royal Society B: Biological Sciences(opens in new tab), scientists trained nearly three dozen silky ants (Formica fusca) to use these acute olfactory receptors for a different task: finding tumors.

— Read more in Ants can detect the scent of cancer in urine at LiveScience.