Text: Some visitors to Sepilok confuse them with the similarly colored red-leaf monkeys but unlike monkeys, orang-utans have no tails.
Entailment: Orang-utans have no tails unlike monkeys, but some visitors to Sepilok confuse Orang-utans with red-tail monkeys,
Contradiction: Nobody confuses red-tail monkeys with orangutans, that's absurd.