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).