Perch

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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.

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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.
Testing a supplemental perch designed to prevent raptor electrocution on electric power poles
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.
Aggressive encounter of a group of blue jays (Cyanocitta cristata) toward a group of scissor-tailed flycatchers (Tyrannus forficatus)
Experienced wildlife photographers add perches to the location by sticking suitable wooden stakes, canes or poles directly into the riverbed or bank.
The king of fishers: after their first clutch of eggs has hatched, kingfishers will spend the spring and summer busily hunting small fish and insects to feed their chicks. If you're interested in snapping this distinctive, colourful bird, now's the time to take your camera and hide down to the riverside
Because wind speed increases with height above the ground, large species may prefer tall perches to gain lift.
Flying dragons: a colorful field experiment in resource partitioning
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.
Time-activity budgets and behaviour of the Amazilia hummingbird, Amazilia amazilia (Apodiformes: Trochilidae) in an urban environment
Some studies have suggested that Cerulean Warblers use larger trees as song perches (Lynch 1981; Robbins et al.
Selection of song perches by Cerulean Warblers
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.
Built-in bird perch spreads the pollen
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.
Long-term structural habitat use of male individuals of two native and one introduced Anolis (iguanidae) species on the north coast of Jamaica
The eagle, nearly four feet tall, perches on his leather-gloved arm.
A Fierce Hunter
Here are instructions for building bird perches to place around your yard.
Make your own habitat art sculpture
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).
Do artificial song-perches affect habitat use by grassland birds in Maine?
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).
Ontogenetic shift in height of sleeping perches of Cope's vine snake, Oxybelis brevirostris

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