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Spotted owls do not build their own nests. They rely on sites such as trees and snags with cavities or broken tops,[link widoczny dla zalogowanych], and platforms associated with abandoned raptor or squirrel nests, witches' brooms (caused by mistletoe infection) and debris accumulations [12][18][20][21][27][30]. Large, old trees are most often used by spotted owls for nesting.[link widoczny dla zalogowanych] Species used as nest trees vary with region and subspecies.
Several studies indicate that tree cavities are most commonly used for nesting by spotted owls, while the extent of platform use varies. In coniferous forests in Oregon, 60% to 93% of nests were in trees with broken tops. Additionally, broken-topped trees (>21 inches (53.3 cm) DBH with 1 or more secondary crowns) had significantly (P<0.001) higher basal area and density in small plots on and around nest sites than in random plots within spotted owls' home ranges [12]. Platform use may be more common in areas that lack large, old trees and snags and have a greater abundance of witches' brooms. Compared to other habitats within their range, northern spotted owls use platforms more often in mixed-evergreen and mixed-conifer forests [12][30]. California spotted owls in southern California use platforms more frequently than those in the Sierra Nevada [4][45]. Platform use also occurred more frequently in oaks than in conifers in the southern Sierra Nevada [20].[link widoczny dla zalogowanych] The average DBH of California spotted owl platform nest trees was significantly (P<0.01) smaller than that of cavity nest trees in foothill riparian and oak woodlands in the southern Sierra Nevada [21]. In grand fir-dominated stands in eastern Washington, northern spotted owls nested in witches' brooms on trees as small as 12 inches (30 cm) DBH [62]. Mexican spotted owls use cliffs and comparatively open areas as nest sites more frequently than the other subspecies [4][27]. Fletcher and Hollis (1994, as cited by [27]) found 9.7% of 248 Mexican spotted owl nests in cliffs, while Steger and others [21] noted only 1 out of 41 California spotted owl nests in a rock cliff in the southern Sierra Nevada.
Spotted owls typically nest in old trees in mature and old-growth forests. Sixty-five percent of northern spotted owl nests sites in coniferous forests of Oregon were in trees greater than 120 years old [13]. On 2 sites in the Coast and Cascade Ranges in western Oregon, 90% of nest sites were in unmanaged old-growth forests,[link widoczny dla zalogowanych] 4% were in mature forests, and 6% were in late-successional forests (70–80 years) with 5 or fewer residual old-growth trees per hectare [30]. In low- to mid-elevation coniferous forests of northwestern California, the minimum nest tree age averaged 288 years, with a range of 57 to 688 years [18].

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A great feature to point out about down throw blankets is that they have got natural oils in them which play a part in bringing warmth and it also helps keep the feathers fluffy, soft and it helps in avoiding clumping as well. Having said that, it's important that you watch how you clean the blanket and try not to wash it too frequently for fear of wearing off the natural oils from the feathers. Also, do use chemical free detergent and don't send the blanket for dry cleaning because that would leave a residue of chemicals on the blanket as well.
If you're about to go shopping for your perfect fluffy blanket now, take the liberty of knowing how it feels so that you'll know just how comfortable your baby will be on those cold nights. Feel the blanket, play with the material and hold it against your face and hands just to see how soft and warm it really is. It's also important that you pick one with a good material, good meaning thick and durable. Since down blankets are made with a variety of materials on the outside, this is very important because if the material is too thin, the feathers might poke through the material and hurt your baby and it's less likely to trap a lot of heat as well.
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