downy woodpecker

Appearance

Adult downy woodpeckers are the smallest of North America's woodpeckers, but there are many smaller species elsewhere, especially the piculets. The total length of the species ranges from 14 to 18 cm and the wingspan from 25 to 31 cm . Body mass ranges from 20 to 33 g . Standard measurements are as follows: the wing chord is 8.5–10 cm , the tail is 4–6 cm , the bill is 1–1.8 cm and the tarsus is 1.1–1.7 cm . The downy woodpecker is mainly black on the upperparts and wings, with a white back, throat and belly and white spotting on the wings. There is one white bar above the eye, and one below. They have a black tail with white outer feathers barred with black. Adult males have a red patch on the back of the head whereas juvenile males display a red cap.

The downy woodpecker is virtually identical in plumage pattern to the larger hairy woodpecker, but it can be distinguished from the hairy by the presence of black spots on its white tail feathers and the length of its bill. The downy woodpecker's bill is shorter than its head, whereas the hairy woodpecker's bill is approximately equal to head length.

The downy woodpecker gives a number of vocalizations, including a short ''pik'' call. One may identify the woodpecker by the pik-call, counting half a second between piks . The rattle-call is a short burst that sounds similar to a bouncing ball, while that of the hairy woodpecker is a shorter burst of the same amplitude. Like other woodpeckers, it also produces a drumming sound with its beak as it pecks into trees. Its drums are slower compared to other North American species.

Behavior

Downy woodpeckers are native to forested areas, mainly deciduous, of North America. Their range consists of most of the United States and Canada, except for the deserts of the southwest and the tundra of the north. Mostly permanent residents, northern birds may migrate further south; birds in mountainous areas may move to lower elevations.

Downy woodpeckers nest in a tree cavity excavated by the nesting pair in a dead tree or limb. In the winter, they roost in tree cavities. They tend to nest near soft snags, where the wood is softer and the inner heartwood of the tree can be accessed more easily. The woodpecker will form a nest cavity in the softer heartwood, and its nest will be protected by the outer portion of the tree. This portion is made up of harder sapwood, which serves as protection from the elements and predators. Heartwood is often softer in dead or decayed trees, as a result, the number of dead trees in a forest and downy woodpeckers habitats are positively correlated in studies. Downy woodpeckers prefer to nest in areas with ample light, leading them to favor trees with broader leaves, such as poplars, birches, and ashes, or forest openings and edges.

Downy woodpeckers forage on trees, picking the bark surface in summer and digging deeper in winter. They mainly eat insects, but they also feed on seeds and berries. They are a natural predator of the European corn borer, a moth that costs the US agriculture industry more than $1 billion annually in crop losses and population control. In winter, especially, downy woodpeckers can often be found in suburban backyards with mature trees where they feed on suet and shelled peanuts provided by mesh birdfeeders.

Habitat

Downy woodpeckers are native to forested areas, mainly deciduous, of North America. Their range consists of most of the United States and Canada, except for the deserts of the southwest and the tundra of the north. Mostly permanent residents, northern birds may migrate further south; birds in mountainous areas may move to lower elevations.

Downy woodpeckers nest in a tree cavity excavated by the nesting pair in a dead tree or limb. In the winter, they roost in tree cavities. They tend to nest near soft snags, where the wood is softer and the inner heartwood of the tree can be accessed more easily. The woodpecker will form a nest cavity in the softer heartwood, and its nest will be protected by the outer portion of the tree. This portion is made up of harder sapwood, which serves as protection from the elements and predators. Heartwood is often softer in dead or decayed trees, as a result, the number of dead trees in a forest and downy woodpeckers habitats are positively correlated in studies. Downy woodpeckers prefer to nest in areas with ample light, leading them to favor trees with broader leaves, such as poplars, birches, and ashes, or forest openings and edges.

Downy woodpeckers forage on trees, picking the bark surface in summer and digging deeper in winter. They mainly eat insects, but they also feed on seeds and berries. They are a natural predator of the European corn borer, a moth that costs the US agriculture industry more than $1 billion annually in crop losses and population control. In winter, especially, downy woodpeckers can often be found in suburban backyards with mature trees where they feed on suet and shelled peanuts provided by mesh birdfeeders.

Reproduction

Downy woodpeckers will start breeding in their first possible season and will return to a site within 2 hectares of where they were born. They breed every year of their mature life, possibly returning to the same nest holes that they used in years prior. Barring the presence of an existing hole, downy woodpeckers will create a cavity in a tree roughly 2.4 to 15.3 m above the ground, with the male woodpecker pecking the hole for roughly half of the daylight hours, in 20 minute work sessions. The nest hole takes about two or three weeks to create, and normally measures 12 to 15 cm wide and about 20 to 30 cm deep.

A female will typically lay 4–5 white eggs, but can lay up to 7. During waking hours, both birds will incubate, or warm the eggs for 15 minute periods, taking turns in alternating shifts. At night, the male woodpecker typically will rest on the eggs for their continued warmth. This incubation period lasts for about 12 days. When the eggs hatch, the infant woodpeckers weigh about 1.6 grams, which will rise to around 3.2 grams over the course of its first day of life. They will appear fully grown by the 17th or 18th day.

These younger birds are demarcated by tinted red crowns for the males, and striped or white dotted crowns for the females. Eventually, these crowns will turn jet black after they finish moulting in summer. The young males will also gain a bright red dot on the back of their head once they reach adulthood. The adult birds will begin to moult earlier than their young. This process starts when their young still occupy the nest, ultimately culminating with replacement of the two strongest, central feathers. These feathers are maintained to retain the bird's climbing power during the two month moult period. When the moulting ends in September, their plumage will have a slight yellow tinge.