were categorized as either continuous (utility wires, fencerows, woodlot edges, and tree-lines; [greater than or equal to] 20 m in length) or isolated (isolated trees, shrubs, and snags).
In this experiment, students test this hypothesis by placing standardized perches
along the margin of a water body and observing perch-height selection by different dragonfly species.
More than 25 members of Troop 622 volunteered Saturday to help him set up the boxes and perches
at the landfill, 2801 Madera Road, just north of the Simi Valley (118) Freeway.
10) trees for song perches
than the average trees available within territories (2 = 27.
The plant's seed provided more evidence that the perches
really matter to the plant.
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
Thermal requirements, social interactions, and avoidance of predators can influence selection of perches
(Schlesinger and Shine, 1994; Downes and Shine, 1998; Ramirez-Bautista and Benabib, 2001).
More likely, if birds use perches
to search for prey, there should be a bias towards perches
with few visual obstructions to prey detection.
If hunting perches
are limited, then it seemed reasonable to expect that the addition of supplemental perches
within shrike territories would allow foraging efficiency to increase by providing shrikes a greater choice of hunting perches
, thereby increasing their opportunity to choose the best hunting area.
were intended to attract birds of prey back into the area to help reduce the rodent population and lessen the use of poisons to control rodent populations.
Microhabitat features surrounding the song perches
of 26 Indigo Buntings (Passerina cyanea) and 24 Painted Buntings (Passerina ciris) in northeast Texas were compared to determine whether these species were segregated according to habitat.
In addition to providing a variety of seeds, birders can simply adjust the perches
with a twist of a knob below the base to attract different size birds.
1 -- color) A Western kingbird perches
near its nest in a sycamore Thursday, the day for tree trimming in the Saugus neighborhood.
Anolis grahami tended to occupy the highest and largest diameter perches
when compared to the other two species studied.
look like mini folders, similar to the ones you see on your Microsoft Windows desktop.