A lot of the animals were sleeping or semi-hidden in shady spots of their spaces, however that's expected for a hot Saturday afternoon in mid-June. Still, there were quite a few active animals and we still go to see a lot in the 4 hours we spent there.
There is quite a bit of walking unless you pay extra for the zoo-mobile rides or whatever they call it, but it was nice to get that exercise in. Most visitors seem to be families with young children, so watch out so you don't trip over all the strollers! It's odd that after over 20 years of living in the GTA, thi past weekend marked my first time at the Toronto Zoo.
Also, it was great to see at least one of the Toronto Zoo elephants before Bob Barker has them shipped out to warmer climates (if you go, definitely stay for a "Meet the Zookeeper" presentation near the elephant area. It was really interesting hearing about how well the elephants have been doing here in Toronto. Two of Toronto's three elephants have surpassed the life expectancy for elephants, which is 38, including when compared to the life expectancy of elephants in the wild!
Highly recommended!