Male and female willie wagtails are identical in appearance, and there is no noticeable difference in size between the sexes.

Behaviour may indicate whether a bird is male or female, with a male likely to be more aggressive and territorial.

He probably calls more than the female.

At nesting time, it is the female that is likely to undertake most of the incubation.

There are probably a few other minor differences in behaviour that you might notice as spring progresses.

A willie wagtail’s white eyebrow mark can be expanded in aggressive display, or reduced in submission.