Number of Larvae 8 Optimum long Optimum short. Arc of diminishing retuns Long Sh
ID: 148426 • Letter: N
Question
Number of Larvae 8 Optimum long Optimum short. Arc of diminishing retuns Long Short Travel Time Searching Time Figure 3-1. The Marginal value Theorem. Long and short travel time represent two tances from the nest to the patch. Searching time is the amount of time starlings spend foraging for dis- mealworm larvae from the feeder. The arc of diminishing efficiency that returns illustrates the decrease in foraging occurs as additional mealworms are collected and held in the beak. This figure is modi- fied from kKrebs and Davies (1993) and Charnov (1976) The value of a particular food item is based not only on its energy content, but also on the time it takes to consume the resource, known as handling time, and the rate at which various types of food items are encountered while foraging. Consider that time spent trying to consume a high energy but time intensive resource could potentially be time spent foraging for less energetically profitable resources that can be consumed at a higher rate. Identifying Bird Species During the field experiment, the birds arrive and leave very quickly from the feeder. You must be able to identify the birds quickly and accurately. To help you identify bird species, your TF will show a video in class of the common bird species found at our sites. Pay attention to the physical description of the bird (colors of feathers, unusual or distinct markings) as well as any distinct behaviors or sounds that each bird makes. Use th e table on the following page to record your own observations of the birds from the video. Summary scription to Birds of North America (BNA), which has wonderful information about al the birds we are studying. To access this site, go to http//bna.birds.comell.edu. While this is a very helpful website, keep in mind that it is not peer-reviewed, and therefore not an appropriate source to cite in a scientific paper descriptions also follow. In addition, BU has purchased an online sub- Description Bird Name Black-Capped Chickadee Tufted Titmouse White-Breasted Nuthatch Downy WoodpeckerExplanation / Answer
Answer:
Black-capped Chickadee: Small and compact, with a thin, short bill. Black cap and bib contrast with white cheeks, gray back and wings, and light buffy underparts. Often move acrobatically through small branches, and can perch sideways or upside-down. Song is a 2-noted, clear whistle, with the second note lower than the first.
Tufted Titmouse: Small, somewhat stocky bird with a big dark eye and a crest. Greyish above and white below with a peach wash on the sides. Adults have black forehead. Very vocal songbird that sing a clear peter during spring and summer. Make nests in the hole of tress.
White-breasted Nuthatch: Compact, no-necked and short tailed bird with a long sharply pointed bill. Blue gray back, stark white cheeks, and black cap. From below it has white belly and rusty spots near its rear. Famous for perching upside down on tree trunks. Nest in hole of trees created naturally or excavated by woodpecker.
Downy Woodpecker: Small with short bill. White below, upperparts mostly black with a white back and bold white spots in the wings. Head striped black and white, with a red nape. Spotting on white outer tail feathers. Pick and probes bark for insects and larvae. Nests in the cavity of trees.
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