An Asiatic elephant eats a Halloween pumpkin as a Halloween treat in Budapest Zoo and Botanical Garden in Budapest, Hungary, Oct. 31, 2019. (Photo by Attila Volgyi/Xinhua)

A western gorilla eats a Halloween pumpkin as a Halloween treat in Budapest Zoo and Botanical Garden in Budapest, Hungary, Oct. 31, 2019. (Photo by Attila Volgyi/Xinhua)

An Asiatic elephant is seen with Halloween pumpkins as a Halloween treat in Budapest Zoo and Botanical Garden in Budapest, Hungary, Oct. 31, 2019. (Photo by Attila Volgyi/Xinhua)

An Asiatic lion is seen with Halloween pumpkins as a Halloween treat in Budapest Zoo and Botanical Garden in Budapest, Hungary, Oct. 31, 2019. (Photo by Attila Volgyi/Xinhua)

Asiatic lions rest by a Halloween pumpkin as a Halloween treat in Budapest Zoo and Botanical Garden in Budapest, Hungary, Oct. 31, 2019. (Photo by Attila Volgyi/Xinhua)

A western gorilla eats a Halloween pumpkin as a Halloween treat in Budapest Zoo and Botanical Garden in Budapest, Hungary, Oct. 31, 2019. (Photo by Attila Volgyi/Xinhua)