One Zoo Three

The brothers unveil their biggest and best enclosure yet, a huge new habitat for the Amur tiger sisters Aleena and Siberia. The boys test out the new 80,000-gallon swimming pool and get hands-on as they prepare to move the world's biggest cats.

It's the zoo's grand reopening and the boys are preparing to open the gates to the public for the first time. The night before Moto the lion took the opportunity to investigate what the animals get up to during the dead of night.

Temperatures rise as the zoo is hit by a heatwave. Many of the animals are well adapted to the sun, but those from cooler climates need extra attention. The boys devise a series of ingenious tricks to keep each animal cool, including ice baths.

The boys welcome some new arrivals to the zoo. Mimo the Pygmy Marmoset emerges from its nest box for the first time and two penguin chicks hatch. Meanwhile, it's Tilly the red panda's birthday, and to celebrate the brothers decide to hold a cake-off.

It's health check day and the boys give each of the animals a thorough MOT. Tamara the tapir gets a pedicure, Marion the tortoise gets a shell rub and the keepers discover a worrying lump on Luna the reindeer's leg.

The One Zoo Three brothers are on a mission to compose a zoo musical using the sounds of the animals. Lar gibbons Shany and Raff swing into action and audition to be the perfect percussionists, while a health check with Bombura the loud kookaburra sees him in with a shout for lead vocals. Even playful jaguar cub Inka proves she can add a cracking big crunch to the mix!