Sniffer sharks

摘要

Do sharks track their prey by steering in the direction of thernnostril that sniffed the stronger prey odour?rnTo find out, Jayne Gardiner at the University of South Florida in Tampa and Jelle Atema of Boston University in Massachusetts fitted eight smooth dogfish (Mustelus canis) with headgear that delivered squid odour to each nostril. When they presented greatly diluted odour to one nostril half a second before delivering full-strength scent to the other, the animals turned towards the side receiving the first, albeit weaker, stimulus, suggesting that timing trumps concentration differences.