Tiny bees, only a few mm long, swarming between flowers of a garden-planted Babingtonia.
When disturbed the swarm flew off but returned to the same position at the end of the branch.
Identified as Hylaeus (Heterapoides) bacillarius by BJ via Bowerbird.
This tiny little bee has been identified as Hylaeus Gnathoprosopis euxanthus by Bernhard Jacobi. Although tiny and black, its large yellow 'collar' and yellow 'knees' made it look distinctive. The antennae look to be a reddish colour.
This Megachile bee appears to be covered in honey. In the last photo, you can see a trail of pollen/honey leading from the nest hole at lower left of picture, to the bee. The bee has been identified as Megachile Hackeriapis canifrons by Bernhard Jacobi, who theorizes that the bee must have been caught in the nest behind the pollen/nectar mix of another Megachile bee and had to move through the mix in order to escape the nest.
This Megachile bee is pictured both leaving and entering her nest in an old fence post which has had a number of holes drilled into it. She has been identified as Megachile Hackeriapis canifrons by Bernhard Jacobi.