Black Heron, Egretta ardesiaca 非洲黑鷺
用傘狀翼形在水面形成陰影來吸引魚來捕捉。
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. This technique was well documented on episode 5 of the BBC's The Life of Birds. 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, crustaceans and amphibians.
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