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THIS WEEK at HILTON POND (Back to Preceding Week; on to Next Week) |
HERE'S "LOOKING" AT YOU: Sometimes when we go to the woods around Hilton Pond Center, we get the eerie feeling that someone--or something--is watching US while we're watching nature. Occasionally, however, the beady little eyes that are staring at us aren't eyes after all--as is the case with the Eyed Click Beetle, Alaus oculatus. All text & photos © Hilton Pond Center Nearly two inches long and found across the eastern U.S. as far west as Texas, this formally attired gray and black and white insect is one of the largest members of the Click Beetle Family (Elateridae); the huge eyespots on its pronotum make it one of the most easily identified. These are "false eyes," of course--likely an adaptation to scare off potential predators. The true eyes of the Eyed Click Beetle are much smaller and located at the bases of its heavily sawtoothed antennae (below left). Few of the 800 or so species of Click Beetles in North America are as dramatically adorned as the Eyed Click Beetle. Most are considerably smaller (a half-inch long or less) and without distinctive markings. Several uniformly brown or black species frequently are seen around porch lights at night. Despite their differences in appearance, all Click Beetles have a startling behavior that demonstrates how they got their primary name--as well as the alternate epithets of "snapping beetle," "skipjack," and "spring beetle." When placed on its back--or when grabbed by an insectivore--a Click Beetle bends its head and prothorax backward and then straightens out suddenly with a snapping motion; this results in an audible click and launches the beetle several inches into the air. This stunt is facilitated by a spine on the underside of the prosternum that fits into a groove in the mesosternum (below).
All text & photos © Hilton Pond Center Occasionally, a Click Beetle will take flight during its midair maneuver, but more often it simply falls back to earth. If it lands on its back the beetle may "click" again, or it may tightly tuck its legs and antennae and "play possum" until the predator loses interest. Eventually, it will wander off, perhaps looking for a little sustenance (flower nectar or leaf sap) or a mate. Click Beetles--like bees, ants, butterflies, and some other insect orders--undergo a four-stage (complete) metamorphosis that includes the egg, larva (AKA "grub"), pupa, and adult. Although adults are harmless, Click Beetle larvae cause significant agricultural and horticultural damage. Click Beetle grubs--also known as "wireworms" because of their elongated shape and hard exoskeletons (above right)--live in soil or dead wood for two to ten years, depending on the species. During that time, they are predatory on other wood-borng insects. Most other wireworm species, by comparison, chow down on roots and stems-- including those attached to corn, potatoes, tobacco, turf grasses, garden ornamentals, and a variety of legumes. We don't grow any of these plants at Hilton Pond Center, of course, but we do have plenty of old wood and wood-boring insects, so we're content to let our local wireworms go about their subterranean business and, as they mature, to delight us with the acrobatic antics of adult Eyed Click Beetles. All text & photos © Hilton Pond Center All contributions are tax-deductible Comments or questions about this week's installment? Be sure to scroll down for an account of all Thanks to the following fine folks for recent gifts in support of Hilton Pond Center for Piedmont Natural History and/or Operation RubyThroat: The Hummingbird Project. Your tax-deductible contributions allow us to continue writing, photographing, and sharing "This Week at Hilton Pond." (Please see Support if you'd like to make a gift of your own. You can also contribute by ordering an Operation RubyThroat T-shirt.)
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Only the sixth of this species ever banded at Hilton Pond Center The following species were banded this week (15-21 May): Chestnut-sided Warbler--1 * = At least one Recent Fledgling Swainson's Thrush Gray-cheeked Thrush |
(female) Adult males are somewhat brighter, with more chestnut
WEEKLY TOTAL (15-21 May 2001) 26 species 57 individuals YEARLY TOTAL (2001) 62 species 530 individuals GRAND TOTAL (since 28 June 1982) 122 species 38,813 individuals Pine Warbler
NOTABLE RECAPTURES WITH ORIGINAL BANDING DATES: American Goldfinch (2) 02/07/97 12/05/98 Northern Cardinal (1) 07/31/93 (Ninth-Year M) Eastern (Rufous-sided) Towhee (1) 07/10/00 Acadian Flycatcher All text & photos © Hilton Pond Center |
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Hilton Pond Center for Piedmont Natural History is a non-profit research & education organization in York, South Carolina USA; phone (803) 684-5852. Directed by Bill Hilton Jr., aka The Piedmont Naturalist, it is the parent organization for Operation RubyThroat. Contents of this Web site--including all articles and photos--may NOT be duplicated, modified, or used in any way except with the express written permission of Hilton Pond Center. All rights reserved worldwide. To obtain permission for use or for further assistance on accessing this Web site, contact the Webmaster. |