Rare antelope chokes to death on plastic cap at Tennessee zoo

Lief, a sitatunga antelope, choked to death on the plastic cap of a squeezable snack pouch at Brights zoo in Limestone, Tennessee. Photograph: Brights Zoo

A rare antelope has choked to death on the plastic cap of a squeezable snack pouch at a zoo in Tennessee, according to zoo staff.

Leif, a seven-year-old sitatunga antelope, was seen acting strangely in his enclosure at the Bright zoo on Saturday, with fluid leaking from his mouth.