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Posts tagged “Spider Egg Cases

Red-eyed Vireo Nest

10-31-13 red-eyed vireo nest  033 Abandoned bird nests are evident now that leaves have fallen off the trees. Consider the time and effort that goes into the construction of one of these single-use nurseries. Take the Red-eyed Vireo’s nest you see here lying on the forest floor. The female selects a nesting site — a time-consuming task, as the requirements are that it conceal the nest and provide shade for her young. (Too much sun will cause her to abandon the nest. One female who had selected a sunny spot was observed pulling nearby green foliage over her nest and fastening it in place with spider webs.) The female vireo then collects nesting material for the three layers of her nest: Exterior – tree bark, spider-egg cases, wasp-nest paper, lichen, green leaves and pine needles. (Nests exposed to sunlight may be decorated with light-colored tree bark such as birch bark.) Interior – bark strips and plant fibers. Inner lining – grasses, pine needles, plant fibers and animal hair. She then weaves these materials into a cup-shaped nest that is suspended from a forked branch by its rim. A trip for materials is made every 3 – 11 minutes and roughly twenty seconds is spent working each load into the nest structure. This intensive work takes the female vireo approximately five days – all accomplished without the aid of any hands or tools, and she only uses the result of all this work once. Fortunately, recyclers make good use of her efforts.

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Invertebrate Signs

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A quick look recently at the underside of a wooden bench sitting in the middle of a nearby field revealed a multitude of signs of insects and spiders that sought shelter in this protected spot.  They included the empty chrysalis of a monarch butterfly, the flat, red egg  sac of a Phrurotimpus  antmimic  spider (look closely and you’ll see bumps in the middle  made by the eggs underneath the silk), the silk and twig case of a bagworm moth larva , and a cocoon which is housing the pupa of a moth.