Predators of treecreeper nests and young include the great spotted woodpecker, red squirrel, and small mustelids, and predation is about three times higher in fragmented landscapes than in solid blocks of woodland (32.4% against 12.0% in less fragmented woodlands). The predation rate increases with the amount of forest edge close to a nest site, and also the presence of nearby agricultural land, in both cases probably because of a higher degree of mustelid predation.[10] This species is parasitised in the nest by the moorhen flea, Dasypsyllus gallinulae.[11] The juvenile survival rate of this species is unknown, but 47.7% of adults survive each year. The typical lifespan is two years, but the maximum recorded age is eight years and ten months.[3]