Kaylee Byers crouches in a patch of urban blackberries early one morning this June, to check a live trap in one of Vancouver’s poorest areas, the V6A postal code. Her first catch of the day is near a large blue dumpster on “Block 5,” in front of a 20-some-unit apartment complex above a thrift shop. Across the alley, a building is going up; between the two is an overgrown, paper and wrapper-strewn lot. In the lot, there are rats. “Once we caught two in a single trap,” she says, peering inside the cage.