PREVIEW

The two dik-diks "Kalle" and "Abena" roam through their enclosure at the zoo. Dikdiks Dikdiks - also known as African dwarf antelopes - grow up to 70 centimetres long and reach a shoulder height of up to 40 centimetres. According to Cologne Zoo, this makes dik-diks one of the smallest antelopes in the world.