Other notable residents include the red-breasted nuthatch, pine grosbeak, red crossbill, and boreal chickadee. The forest is home to the endangered capercaillie and endemic Scottish crossbill. It also supports populations of Scottish crossbill and capercaillie. The Scottish crossbill ("Loxia scotica") is a small passerine bird in the finch family Fringillidae. However, the crossbill is the only finch that can twist its mandibles in opposite directions. The Scottish crossbill is the only endemic vertebrate species in the UK. Wildlife includes many birds, including the crossbill which are adapted well to the conifers. A major threat to the crossbill is climate change. The "chip" call is weaker and higher than that of the red crossbill. This can be another mechanism to how the Cassia crossbill diverged from the red crossbill. This species of crossbill is resident, and is not known to migrate. Wildlife found around Wyming Brook includes the dipper and the crossbill. This crossbill is mainly resident, but often irrupts south when its food source fails.