Here's a video of a easier bird to see, an Eastern Reef Egret, chasing small fish along a muddy creek. Fairly common on coastlines of Western Australia, but this video was taken at Cairns in north Queensland. These birds come in two morphs; this video is of the dark morph, which almost looks like a White-faced Heron.
There is also the white morph, which basically just looks like a small white egret.
|White morph Eastern Reef Egret|