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PERCH, measure. The length of sixteen feet and a half: a pole or rod of that length. Forty perches in length and four in breadth make an acre of land.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
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Numerous supplemental perch designs have been installed on power poles in the northwest and throughout the US, but to our knowledge no studies reporting if or how raptors use such perches, or how supplemental perches might be improved, are currently available.
Unobstructed viewing perches of this height in the area are rare, this being the only perch of its type at any height to allow a view of the old field to the northeast and the athletic field to the south.
Because wind speed increases with height above the ground, large species may prefer tall perches to gain lift.
In this paper the time Amazilia hummingbird allocates to its different activities, the frequency of its visits to different species of flowers and the characteristics of the perches it used is studied, with the objective of providing some information about the ecology and behaviour of this scarcely studied bird in an urban environment.
Some studies have suggested that Cerulean Warblers use larger trees as song perches (Lynch 1981; Robbins et al.
Researchers speculate that males might especially favor perches to protect their tail feathers, which are longer than those of females, from the wear and tear of ground landings.
Anolis lineatopus was observed far more frequently in the shade than the other two species, and hence may not compete with the other species for shady perches. Cuban and Floridian A.
The eagle, nearly four feet tall, perches on his leather-gloved arm.
Here are instructions for building bird perches to place around your yard.
The song-perch limitation hypothesis also has interesting evolutionary implications because the development of flight song has enabled many species of grassland birds, including at least eight families worldwide, to adapt to habitats lacking conspicuous, fixed perches (Van Tyne and Berger, 1959:142; Wells and Vickery, in press).
However, during the inactive period (i.e., at night) crypsis is less effective because inactive snakes are likely to be encountered by predators using non-visual cues and, therefore, snakes must rely on alternative tactics, such as occupying perches or retreats inaccessible to predators (Martins, 1996).