It's a little bit more than the animals going in two by two as staff at Bristol Zoo are conducted their annual census.
The aim is to checking the population and make sure their information boards are accurate. It also helps to see if their breeding programmes are successful.
There are more than 400 species at the zoo and keepers say the population is growing because of successful breeding programmes.
Kylie spoke to Sarah Little from Bristol Zoo and asked her why they do it.
Keepers at Bristol Zoo Gardens are celebrating 40 years since the arrival of their oldest inhabitant - Biggie the giant tortoiseRead the full story ›
Bristol Zoo's newest, cutest arrival - an endangered baby pygmy hippo - has sadly died at just five weeks old.
Bristolians and keepers at the zoo were thrilled when the gorgeous youngster joined proud mum Sirana and dad Nato in the zoo's Hippo House last month. The baby, who had yet to be named, enjoyed paddling in the heated pool and nuzzling its mum.
The team at the zoo tried hard to save the little one's life when it became ill on Wednesday night, and say they are devastated by the loss.
"It is with great sadness that we announce the loss of our baby pygmy hippo. The five week old calf became ill overnight on Wednesday and was being treated by our vet team. Unfortunately, despite their best efforts, the youngster passed away yesterday. This is a very upsetting time for our keepers and we know you will all share in our sadness."
WATCH: Baby plays with proud mum Sirana in the zoo's heated pool.
A baby pygmy hippo has been born to proud parents at a zoo in Bristol.Read the full story ›
Bristol Zoo’s baby gorilla Kukena is about to celebrate his fourth birthday.
Kukena was born on September 27th, 2011 to mum Salome and the troops’ silverback Jock.
Jock and Salome are genetically important gorillas because their genetic lines aren’t highly represented in the European breeding programme for this species and as a result so is their offspring.
Kukena is a lovely cheeky young male. He is full of character and enjoys playing with all members of our group, including the other females we have.
Increasingly over the last year we have also seen him spending more and more time with ‘the boys’ – Jock and Kukena’s older brother Komale, who turns nine years old at the end of the year.
He still shares a nest with mum Salome but he is becoming increasingly independent.
Bristol Zoo has welcomed the birth of a rare chick.
The Mindanao bleeding-heart dove is native to the Philippines. It is one of many species in the area threatened by the loss of 95% of the country's forests.
Bristol Zoological Society has been working on the islands for two years to stop the decline. It aims to make local people aware of the value of conserving the species and their habitats.
Three endangered yellow-headed day geckos have been born at Bristol Zoo.
Due to habitat loss the species has been declining in the wild and as a result they are now classified as an endangered species.
They are usually found in the tropical rainforest of Madagascar, but these days old tiny trio are adapting to life in a different continent in Bristol Zoo's Reptile House.
They usually live in small groups and spend most of their day basking in the sunshine. If disturbed, however, the lizards will immediately return to their hiding place, usually a small crack in the older or dead bamboo.
The yellow-headed day gecko has distinguishable features, such as a yellow head, a flattened body, a long snout and a turquoise back and tail.
They can reach a total length of 8 to 10 cm, although span just 2.5cm at hatching. They feed on various insects and other invertebrates. They also like to lick soft sweet fruit, pollen and nectar.
Gorillas at Bristol Zoo have pledged their support to Bristol City after they were given some new playthings with a football flavour.
They were presented with City kits and banners ahead of the Johnstone's Paint Trophy final on Sunday. The Robins are due to play Walsall at Wembley and seem to have some welcome support from the apes.
Bristol Zoo has lost some of its most precious animals after a male warty pig ate his entire critically endangered family - and a rare monkey became lunch for hungry otters.
The two pigs, pictured above in happier times, were found in distressing circumstances when Elvis turned on his piglets and then his own mate.
In another instance, a rare monkey escaped its enclosure and fell into a pond where it was eaten by American otters.
The zoo, which prides itself on its conservation measures, said the deaths have distressed keepers.
A whistleblower has raised concerns about a series of incidents at Bristol Zoo, including a rare pig eating its entire family.Read the full story ›