When cutting back the sapling trees in the old field habitat (we don't want trees to take over one of the few remaining open areas at the FWG) I discovered a song sparrow nest in a fork formed by the sucker growth from previous year's cutting, about 1 foot above the ground. Song sparrows nest on the ground (we've found their nests ensconced in DSV vines), or not too far above it in shrubs or other sturdy vegetation.