Yup, I recall hearing of moose attacks, and even a mountain lion attack... but these ultimately are quite rare... unlike the "zoo" on the daily road commute.
I used to open ocean swim... about a half mile a day, up to 2 miles on weekends... in water known to have sharks. Cycling on the road with cell phone addled drivers was much more dangerous.
I live in an area with waters a bit too cold to enjoy that swim now.