In her new project capturing motion-sensor photos of urban wildlife, ecologist and professor Julie Ellis said one of her favorite images is of a mother raccoon facing her three offspring, who are all staring back intently. It made her wonder what kind of conversation must be going on, whether the children are being told to hurry up or are learning how to catch a crayfish.

"It's those little glimpses into their daily lives that you get from these cameras that I think is really fun, and tells us a lot about what these animals are doing right under our noses," said Ellis, a director at the University of Pennsylvania School of Veterinary Medicine. MORE: Montgomery, Bucks and Berks counties are approaching 'peak' fall foliage

Ellis and her team are in the process of placing between 30 a

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