We used scent stations with a sand, lime, or lamp-black base to determine the types of mammals in the greenways.

Animals that come within a few yards of the stations are attracted by a urine or fish oil scent. When they move in to investigate, they leave their tracks in the medium.

Scent stations are set up in the late evening and checked the next morning.

We used predator cameras to determine which animals prey on bird nests.

A camera is connected to a switch that is connected to a plasticine egg. When a predator pulls the egg, the camera photographs it..

Cameras were left out for two weeks, or until a predator took the bait.

Total abundance of mammalian nest predators increased significantly as forest corridor width decreased.

We found no relationship between categorical measures of land-use (office/institutional, high-density residential, lowe-density residential) and total abundance of mammalian nest predators.

Greenways adjacent to landscapes with fewer buildings had a higher abundance of mammalian nest predators. The abundance of individual species varied with the amount of canopy, lawn, and pavement in the adjacent landscape.

Some measures of habitat structure of greenways also were correlated with the abundance of mammalian nest predators. Greenway segments with wider trails had a higher abundance of mammalian nest predators, as did segments with a higher percentage of mature forest. No habitat structure variables were significant for all species.

To reduce the overall risk of avian nest predation by mammals, forested greenways should be designed with wider forest corridors and narrower, unpaved trails.

Some greenway characteristics that favor high-nest predator populations also favor birds of conservation concern. Similarly, some characteristics correlated with lower predator occurrence are also correlated with lower abundance of birds of conservation concern. Thus, management of greenways and the surrounding landscape must balance reduction of predator communities with the promotion of desired bird communities and other conservation goals.