A couple of giant otters give birth to four pups after losing their first litter a few months ago. However, dad Tarubu need to step up and become more responsible - especially after leaving one of the little ones outside late at night. Red river hog Kya is being bullied by her triplet sisters. Losing weight and dangerously fragile, she will need to build up her strength and fight back if she is to survive. Keepers worry about batagur turtle Donatello, who is off his food and swimming at an odd angle.

Newcomer Safi, a rare bongo antelope from the mountains of Kenya, is giving enthusiastic breeding partner Moti the runaround. Very soon the keepers realise why - it seems she may be about to give birth earlier than expected. Sunda gharial crocodiles Frank and Frankie need to have their blood tested - but taking a sample from one of the world's largest and most dangerous reptiles is easier said than done - and George the giant rat needs to have surgery after an X-ray pinpoints a huge lump of hard faeces in his stomach.