Swamp Boubou Laniarius bicolor

Chunky black-and-white bushshrike. There is a white slash across the wing, and the underparts are pure white. Uses habitats that include marsh, gallery forest and woodland, thick scrub, and mangroves. Found in pairs, which usually skulk, but sometimes hop about in the open. Song is a perfectly synchronized duet in which the male gives a hollow rising whistle and the female a low ratchet. Similar to Tropical Boubou, but easily separated by lack of rufous tones to the underparts and different vocalizations.