In Japan, it's traditional to enjoy a grapefruit hot spring during Winter Solstice. And, in recent years, it's not just for humans.

Monkeys in a zoo in Fukuoka spent the day eating the fruit and soaking up the warmth while capybaras in a zoo in Nagano prefecture enjoyed the spa treatment. Japanese believe soaking in a grapefruit-filled hot spring is a great way to keep away the winter blues.

Capybaras in a zoo in Nagano prefecture enjoyed the spa treatment.