The treecreeper spirals up tree trunks probing bark crevices for invertebrates, then flies to the base of the next tree to repeat the process. Its welfare depends on mature woodland with rough-barked veteran trees providing both food and roosting sites.
Treecreeper welfare depends on the structural diversity of mature woodland. Young plantation trees with smooth bark provide neither the foraging crevices nor the roosting opportunities treecreepers require. Veteran trees — ancient oaks, ash trees and mature larch with deeply furrowed bark — support the invertebrate communities in bark and the physical structure treecreepers exploit. Dead and dying trees with loose bark provide critical nesting sites. Night roosting in specially excavated hollows in soft-barked trees — a distinctive treecreeper behaviour — requires mature trees with appropriate bark properties. Gardens with large mature trees and woodland with retained veteran trees support treecreeper populations with reliable welfare outcomes.