Good observation -- hare populations near me on the Upper Hillside are as high as I've seen in the past ~10 years.  That said, I've seen solitary lynx ambling along local roads in the middle of the day, and on the prowl in Far North Bicentennial Park, at least once a year over the same period.  Maybe higher litter sizes and kit survival due to the extra hare explains the large group sighting, though.