They're on "shark watch" in the Florida Keys today.
"Katharine" the 14-foot Great White shark seen cruising off the coast of Miami Beach Sunday is heading south due east of Key Largo.
Research scientist Derek Burkholder at Nova Southeastern University says satellite tags have been tracking Katherine since last August when she was spotted off the coast of Cape Cod.
Researchers are curious to see if she returns to Cape Cod later this summer.
If she does not, then Katherine may be pregnant.
You can track "Katharine's" progress at www.ocearch.org