Great hammerhead

Dec-Mar. Single source for the window.

Open year-round with no closure. Jun-Sep is the peak tourist season and the drier half; Dec-Mar is warmer, wetter and carries the hammerhead window. The two headline seasons pull in opposite directions, which is the useful thing to know before booking. Low operating

Dec-Mar. Critically endangered globally; the Bahamas has a national shark sanctuary, which is part of why the aggregation persists here.

Runs year-round. Jun-Sep is Atlantic hurricane season and individual trips get cancelled or rerouted, hence 'limited'. Note the two peaks pull in different directions: Oct-Jan for tiger numbers, Dec-Mar for great hammerheads, with Dec-Jan the overlap. Low operating