The male birds have a bright green or blue head, while the female's is light brown.

The robot came to a halt before him, and bowed its blue head slightly.

That made them stand out as alien; blue heads were turning.

Star is an all black bird with a blue head.

The beast's enormous blue head bobbed up between the trees.

What she seemed to be looking at was a giant with a blue head.

And so is that great blue head you saw up there.

It surprised me, coming out of that bald blue head.

Her blue head can still be seen jutting out from a ledge.

Then an alien with a blue head showed up.