Taken from Wikipedia:
It is a medium-sized(42.5–66 cm in height), black plumaged heron with yellow legs and feet. It is found south of the Sahara Desert, including Madagascar, and prefers shallow open, waters, such as the edges of fresh water lakes and ponds...
The black heron has an interesting hunting method, called canopy feeding - it uses its wings like an umbrella, and uses the shade it creates to attract fish. Some black herons feed solitarily, while others feed in groups of up to 50 individuals, 200 being the highest number reported. The black heron feeds by day but especially prefers the time around sunset. It roosts communally at night, and coastal flocks roost at high tide. The primary food of the black heron is small fish, but it will also eat aquatic insects and crustaceans.