ANN ARBOR, Mich., Jan. 7 (UPI) -- Fossils have shown the earliest known example of shark migration, a behavior that persists today among species such as tiger sharks in Hawaii, researchers say.
More than 300 million years ago long-snouted Bandringa sharks migrated downstream from freshwater swamps to a tropical coastline to spawn, leaving behind fossil evidence of one of the earliest known shark nurseries, a paleontologist at the University of Michigan said in a release Tuesday.