So off we went to Bristle zoo, and had a very enjoyable few hours showing my little boy traditional fauna, including the lions, or "Rahs!" as he calls them. A 'rah' also refers to a tiger, a red panda and, worryingly, socks. Mind you, he calls crocodiles "Neighs" so I'm not expecting much of a zoological future for him.
One thing he did seem to enjoy was the aquarium, and it was fun to point out the fish, of various hue and girth, which he dutifully pointed at all excitedly. One area was a tunnel through which you can walk under the aquarium and look up at the fish, in this manner:
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A little later on, we came across the river otters, and obviously he was far more interested in the traditional otter food of . . .
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I'm thinking of taking him to a dedicated aquarium next, where divers get eaten if they spend to long with their algae scrapers.