A capuchin monkey plays with an Easter egg during a special Easter Day activity at the Zagreb Zoo in Zagreb, Croatia, April 13, 2020. (Photos: Xinhua)

A red panda looks at Easter eggs during a special Easter Day activity at the Zagreb Zoo in Zagreb, Croatia, April 13, 2020.

An Easter egg is given to lions during a special Easter Day activity at the Zagreb Zoo in Zagreb, Croatia, April 13, 2020.

Anteaters play with Easter eggs during a special Easter Day activity at the Zagreb Zoo in Zagreb, Croatia, April 13, 2020.

A meerkat plays with an Easter egg during a special Easter Day activity at the Zagreb Zoo in Zagreb, Croatia, April 13, 2020. (Sandra Simunovic/Pixsell/Handout via Xinhua)

A gibbon plays with an Easter egg during a special Easter Day activity at the Zagreb Zoo in Zagreb, Croatia, April 13, 2020.

A monitor lizard eats Easter eggs during a special Easter Day activity at the Zagreb Zoo in Zagreb, Croatia, April 13, 2020.