There are 400,000 stray cats roaming the streets of Philadelphia. The city tries to handle the problem through a program called Trap, Neuter, Release or TNR. But WHYY reporter Peter Crimmins says a feral cat colony on the Delaware River waterfront has city agencies, environmentalists, and cat-lovers pitted against each other, debating whether or not TNR is best — and whether or not cat welfare should be of concern. Why can’t Philly find a way to deal with these cats? Peter explains on this episode of The Why.