Me five minutes later slowly creeping up on a squirrel with the camera in front of my face:
With the 1.6x crop factor of a Canon APS-C sensor, the lens has an equivalent field of view to a 27-88mm zoom on a full frame camera. That 88mm is on the short end of telephoto length, fine for portraits but way too short for wildlife.
Starting with that upper photo from probably a dozen feet away, I had to slowly inch my way up to maybe double-arm's-length to get the lower shot.
