Compared to the Suisun Marsh to the south and west, the Montezuma Hills have a relatively unabundant diversity of birds and other wildlife. Among the Montezuma Hills are a number of intermittent drainage swales that flow during winter months; otherwise the monotypic dryland farms support even less diversity of wildlife than more agriculturally diverse land uses to the north. Exceptions to the dearth of wildlife are the considerable populations of ground squirrels and other small rodents, which populations in turn support modest numbers of raptors. Birds present in moderate numbers are the red-winged blackbird, cliff swallow, northern harrier and barn swallow. Moderate numbers of avian nests have been documented in the Montezuma Hills including red-tailed hawk, American kestrel and historic nests of the golden eagle.