Scientists develop a daring pregnancy exam... for sharks

A female shark swims in shallow water near Little Bahama Bank nicknamed Tiger Beach because of the numerous tiger sharks found in the area. Photos: TNS

For years, warm shallow waters in a corner of the Bahamas have drawn an astonishing number of large tiger sharks, mystifying scientists studying their epic migration patterns.

Now a team of scientists, including University of Miami shark expert Neil Hammerschlag, may have their answer thanks in part to a new study technique relying on ultrasound.