Last weekend (16-17) July there were about 100 "inshore" Bottle-nosed Dolphins in outer Sydney Harbour. They were seen from the Halicat in Rose Bay, Aplin Bay, Fort Denison, Middle Head, Bradleys Head, Pig and Sow, etc. A lot of them looked heavy bellied, but others were smaller (juveniles) and there were a few small calves. My interpretation (hypothesis) is that this was an amalgamation of a few smaller family pods of females and their juveniles, many of the females pregnant (apparently adult males form males only pods (usually, elsewhere). I reckon they were in the harbour to calve. Today (24 July), could not find them in any of these areas. Perhaps the freshwater in the harbour and outside the heads after this week’s heavy rains led them to head back out to sea?