Chester Zoo has made it into a list of top 10 world zoos compiled from reviews by global travellers.
The Cheshire zoo was in sixth place in the world list and was voted the second-best zoo in Europe and the UK's best zoo in the tables published by TripAdvisor.
Two other UK zoos were in the European top 10 - with Colchester Zoo in Essex eighth and Paignton Zoo in Devon ninth.
In all, the UK had eight zoos in the European top 25 - more than any other European country - with Folly Farm in Begelly in South Wales 13th, Blackpool Zoo 14th, Durrell Wildlife Park in Jersey 21st, Cotswold Wildlife Park and Gardens at Burford in Oxfordshire 22nd and Knowsley Safari Park at Prescot in Merseyside 25th.
There was also a UK entry in the top 10 European aquariums' table - with The Deep at Kingston upon Hull in ninth place.
Chester is home to more than 11,000 animals from more than 400 species and is set in 110 acres of zoological gardens.
Chester Zoo managing director Jamie Christon said: "We're absolutely delighted to have received this seal of approval from the public .
"Our sincere thanks go to every single person that has come here because, as a registered charity, their visits help us to carry out all of our vital conservation work - saving species from extinction both here in the UK and overseas."
The eight UK zoos in the top 25 European table took the first eight places in the UK zoo list, with South Lakes Safari Zoo at Dalton-in-Furness in Cumbria ninth and Blair Drummond Safari and Adventure Park at Stirling in Scotland 10th.
Best world zoo was Henry Doorly Zoo, at Omaha in Nebraska, USA. Top European zoo was Loro Parque at Puerto de la Cruz on Tenerife, while the top European aquarium was Oceanario de Lisboa in Lisbon, with the world title going to Monterey Bay Aquarium in California.
TripAdvisor spokesman James Kay said: "These awards are based on the millions of reviews and opinions written by our global community of travellers.
"So if you're looking for some inspiration for a great family day out, the UK winners are a great addition to your summer holidays hit list."
These are the UK's top zoos according TripAdvisor:
1. Chester Zoo, Cheshire
2. Colchester Zoo, Essex
3. Paignton Zoo Environmental Park, Devon
4. Folly Farm Adventure Park and Zoo, Begelly, South Wales
5. Blackpool Zoo
6. Durrell Wildlife Park, Trinity, Jersey
7. Cotswold Wildlife Park and Gardens, Burford, Oxfordshire
8. Knowsley Safari Park, Liverpool, Merseyside;
9. South Lakes Safari Zoo, Dalton-in-Furness, Cumbria
10. Blair Drummond Safari and Adventure Park, Stirling, Scotland.