Crying babies and a mooing cow children’s toy.

“Perry once buried microphones at the base of a palm tree and thumped it rhythmically to produce a mystifying bass drum effect; his drum booth at the Black Ark was for a time surrounded with chicken wire to further his distinctive sound; many of his songs are layered with a variety of subtle effects created from broken glass, ghastly sighs and screeches, crying babies, and a mooing cow children’s toy. These and other notable recording techniques helped define the Black Ark sound, as well as Lee Perry’s creative legacy.”
Wikipedia: Lee Perry’s Black Ark studio