There is a bit of post-Christmas cheer on the menu for elephants and other tenants at Berlin zoo: they can chomp on Christmas trees that didn’t find a home. The trees arrived on Thursday in what has become an annual event. The elephants tore off branches with their trunks and either ate them or tossed them around their enclosure. The zoo’s European bison nestled into the trees before starting to munch on them, while reindeer sniffed and played with theirs. The zoo takes only fresh, unsold trees from selected vendors. It does not accept trees from the public, which could contain chemicals or leftover decorations.