If you're heading to the Westcountry, it's well worth taking a detour off the M5 to visit
Noah's Ark Zoo Farm.

Meerkats at Noah's Ark Zoo
With over 100 species spread around 100 acres, you should aim to spend at least half a day exploring. Some of the first animals I encountered were the white rhinos, called Rumba and Rumbull. I was impressed at how close I could get, with Rumbull posing for the camera only a couple of metres from me.

Rumbull the rhino
I like how they've put up these signs telling you how to recognise the individual animals and even a bit about their personalities:
Just next to the rhino enclosure is the flying field, where displays take place every day at 1230.

Flying display at Noah's Ark Zoo
It's worth walking around the main part of the zoo at least twice, as you'll see a lot more that way. The elephants were quite distant the first time round, but we eventually had a great view at feeding time:

Shaka the elephant enjoying his carrots
Other big animals include lions, bears, giraffes and camels.
There's a good café near the entrance, and there are plenty of children's play areas dotted around the site.
They also have a very good reptile house and several bird enclosures. Unfortunately, I had to rush around this part of the zoo, as I spent too long looking at the rhinos and camels.
It may not be as famous as nearby Bristol Zoo, but I was pleasantly surprised at how much there was to see, and will definitely be going back.