The open ocean has a smell, and some seabirds use it to find dinner. The signal is dimethyl sulfide, or DMS, a volatile compound released when tiny grazers feed on algae. Petrels and shearwaters can follow its scent toward productive waters, where the grazers themselves may attract fish and other prey. The trail is indirect.A bird's nose deserves more credit than it usually gets. DMS production is...More