I am very familiar with a section of the Little Rouge Creek located just north of the zoo.
For a few years, I ran lichen, frog, woodcock, screech owl, plant and other surveys here for the Toronto Region Conservation Authority and visited the area in all seasons.
There is evidence of beaver here:
and evidence of humans:
On the December morning I visited, there were no birds except for some Canada Geese high in the sky:
Some other plants:
The buds of Canada Plum seem to double as thorns!