Monkeys did not move outside but stayed in their cages.

A peacock bathes with sand. A bird-carer at the zoo said this was the hobby of peacocks, which helps kill  parasites while fighting the heat.

During a heat wave like this, long-tailed monkeys drink more water.

A white-cheeked gibbon always carries a water bottle left by visitors to drink every single drop.

Hippos are species with thick but sensitive skin. They need to take a dip in the water, especially on sunny days.

At noon, a crocodile lying motionless under cool water.

Tibetan bears also soak themselves in water all day.

A civet sleeps after a bath. A worker said in summer, civets drink more water and bathe more so workers have to clean the cage and change the water twice a day.

Not only animals in the zoo struggle against heat, a pair of buffalos in Hanoi’s suburbs soak themselves in water for several hours.

A dog bathes at the West Lake, Hanoi.

At a "salon" for dogs and cats in Ba Dinh District, more people take their dogs there for a bath.

Ms. Nhung, the pet salon manager, said in the summer, long-haired dogs need more hair cut to cool down their body heat.