From: mass.gov

Young forest habitats, areas of densely clustered tree saplings and sprouts, have become relatively scarce in Massachusetts over the past 50 years, and now occupy less than 4% of the forested landscape. MassWildlife’s habitat goals call for 10-15% young forest to conserve wildlife that rely on this unique habitat including New England cottontail, American woodcock, ruffed grouse, and golden-winged warbler. The species have experienced decline and need young forests for nesting, foraging for food and evading predators. These same habitats are also used by many songbirds, and by game species such as white-tailed deer, wild turkey, and black bear.

The state is providing technical and financial aid for landowners to create young forests. More details can be found on their page, while information about young forests can be found here.