Striated Herons (Butorides striata) are often seen standing still at the edge of ponds and trenches where they wait to ambush prey such as small fish, frogs and insects.  They have a bluish-grey back and wings and a black cap with short yellow legs.

Striated Heron perched on shrubs at Bounty Farm, Timehri (Photo by Kester Clarke www.kesterclarke.net)