Whalewatchers were thrilled when a humpback breached in front of their boat at Manly today.
The group of three adults and a calf were seen travelling south just off Manly Beach this morning, Jonas Liebschner of Whale Watching Sydney said.
"We now starting to see a lot of mothers and calves on their way south again," he said.
"Most of the calves were born up north a couple of weeks or months ago.
"We believe there is about a 10 per cent increase in humpbacks each year so we should be up to about 20,000 by now just off the east coast.
"Usually mothers and calves come quite close in, so people may see them from land. They should keep an eye out to sea," he said.