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Short Toed Treecreeper (S.Allen)

Short-toed Treecreeper - Stephen Allen

The Short-toed Treecreeper (Certhia brachydactyla), is a small passerine bird found in woodlands through much of the warmer regions of Europe and into north Africa.

It has a generally more southerly distribution than the other European treecreeper species, the Common Treecreeper, with which it is easily confused where they both occur. Short-toed Treecreeper tends to prefer deciduous trees and lower altitudes than its relative in these overlap areas. Although mainly sedentary, vagrants have occurred outside the breeding range.

Short-toed Treecreeper is one of a group of four very similar Holarctic treecreepers, including the closely related North American Brown Creepers, and has five subspecies differing in appearance and song. Like other treecreepers, Short-toed is inconspicuously plumaged brown above and whitish below, and has a curved bill and stiff tail feathers. It is a resident in woodlands throughout its range, and nests in tree crevices or behind bark flakes, laying about six eggs. This common, unwary, but inconspicuous species feeds mainly on insects which are picked from the tree trunk as the treecreeper ascends with short hops.

All the treecreepers are similar in appearance, being small birds with streaked and spotted brown upperparts, rufous rumps and whitish underparts. They have long decurved bills, and long stiff tail feathers which provide support as they creep up tree trunks looking for insects.

The Short-toed Treecreeper is 12.5 centimetres (5 in) long and weighs 7.5–11 grams (0.26–0.39 oz). It has dull grey-brown upperparts intricately patterned with black, buff and white, a weak off-white supercilium and dingy underparts contrasting with the white throat. The sexes are similar, but juveniles have whitish underparts, sometimes with a buff belly.

The call of this species is a repeated shrill tyt...tyt tyt-tyt and the song of the nominate subspecies is an evenly spaced sequence of notes teet-teet-teet-e-roi-tiit. There is some geographical variation; the song of Danish birds is shorter, that of the Cyprus subspecies is very short and simple, and the North African version is lower pitched. European birds do not respond to latter two song variants.

This species shares much of its range with the Common Treecreeper. Compared to Short-toed, that bird is whiter below, warmer and more spotted above, and has a whiter supercilium and slightly shorter bill. However, identification by sight may be impossible for poorly-marked birds. Vocal birds are usually identifiable, since Common has a distinctive song composed of twitters, ripples and a final whistle and a shree' call rarely given by Short-toed; however, both species have been known to sing the other's song. Even in the hand, although Short-toed usually has a longer bill and shorter toes.
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Short-toed Treecreeper - courtesy of Wikipedia

The Short-toed Treecreeper breeds in temperate woodlands across Europe from Portugal to Turkey and Greece, and in north west Africa. It prefers well-grown trees, especially oak and avoids pure stands of conifers. Where it shares its European range with Common Treecreeper, the latter species tends to be found mainly in coniferous forest and at higher altitudes.

This species has an extensive range of between 1–10 million square kilometres (0.4–3.8 million square mi). It has a large population, estimated at between 4.1–14 million individuals. Population trends have not been quantified, but the species is not believed to approach the thresholds for the population decline criterion of the IUCN Red List (declining more than 30% in ten years or three generations). For these reasons, the Short-toed Treecreeper is evaluated as Least Concern.

The Short-toed nests in tree crevices or behind bark flakes. Old woodpecker nests, crevices in buildings or walls, and artificial nest boxes or flaps are also used.

The nest has an often bulky base of twigs, pine needles, grass or bark, and a lining of finer material such as feathers, wool, moss, lichen or spider web. The eggs are laid between April and mid June (typical clutch 5–7 eggs); they are white with purple-red blotches, 15.6 x 12.2 mm (0.6 x 0.5 in) in size. The eggs are incubated by the female alone for 13 – 15 days until the altricial downy chicks hatch; they are then fed by both parents, but brooded by the female alone, for a further 15 – 18 days to fledging. This species often raises a second brood. The male starts constructing a new nest while the female is still feeding the first brood, and when the chicks are 10–12 days old, he takes over feeding duties while the female completes the new nest.

A Spanish study suggests that forest fragmentation adversely affects the numbers of Short-toed Treecreepers present, as is also the case with the Common Treecreeper. Species that depend on relatively scarce resources, such as tree trunks, only occupy the larger forests, whereas those such as tits and Common Firecrests that exploit abundant, ubiquitous resources are distributed uniformly through woodlands of all sizes.

The Short-toed Treecreeper typically seeks invertebrate food on tree trunks, starting near the tree base and spiralling its way up using its stiff tail feathers for support. Unlike a nuthatch, it does not come down trees head first, but flies to the base of another nearby tree. It uses its long thin bill to extract insects and spiders from crevices in the bark. Although normally found on trees, it will occasionally feed on walls or bare ground, or amongst fallen pine needles. It may add some seeds to its diet in the colder months.

As a small woodland bird with cryptic plumage and a quiet call, the Short-toed Treecreeper is easily overlooked as it hops mouse-like up a vertical trunk, progressing in short hops, using its stiff tail and widely-splayed feet as support.. Nevertheless, it is not wary, and is largely indifferent to the presence of humans. It has a distinctive erratic and undulating flight, alternating fluttering butterfly-like wing beats with side-slips and tumbles. It is solitary in winter, but in cold weather up to twenty or more birds will roost together in a suitable sheltered crevice, or in a star formation under eaves of buildings.

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