As @rural mouse said, if they can land, they will use it. Platform feeders are specifically designed for ground-feeding birds like Doves and such. Obviously the feeder in the second picture wouldn't work for crows - the first one would without the roof. In my quick search of platform feeders, I was only finding ones that hung, which could pose problems with squirrels. Sorry my selection of feeders was sub-par.Don't crows feed on the ground rather than bird feeders?