In breeding condition , its forecrown has a purplish gloss .
Its upperparts have a slaty - green tinge , there are a few white plumes around the eye and neck and a few white streaks at the rump .
In breeding condition , its forecrown has a purplish gloss and its upperparts have a slaty - green tinge , there are a few white plumes around the eye and neck and a few white streaks at the rump .