Two golden lion tamarin monkey babies have been introduced to visitors at Cologne Zoo. Tiny, lively and with golden yellow fur, the two sisters – named Tiara and Lenina – were displayed to the paying public for the first time on Friday. The zoo says the two babies were born in April, and have now settled in well with the group. Their parents are called Apu and Nala. Golden lion tamarin monkeys are a species of marmoset. They use chirping sounds to communicate, and are climbing experts. Occasionally, they catch and kill small vertebrates, but the monkeys mainly feed on fruit and tree sap. They …