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... Science Frontiers ONLINE No. 114: Nov-Dec 1997 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Do woodcocks "grunt" for worms?Earthworms have a potentially fatal habit: When they detect vibrations propagating through the ground, they quickly squirm their way to the surface. Perhaps they think a mole is tunneling after them, or maybe rain is beating down above. Whatever goes through their "minds," they emerge on the surface in response to vibrations and may be snapped up by several species that know their weakness. Human fishermen know the worms' weakness and "grunt" for them in several ways; say, by drawing a notched stick across the trunk of a small tree to generate vibrations. Wood turtles are said to ... stomp" for worms. (SF#65) Kiwis and Kagus also stomp for their dinner. (Kagus are rather strange birds found in New Caledonia.) We have just learned that Woodcocks will beat their wings against the ground to coax earthworms within range. (Hennigan, Tom; "A Wonderfully Bizarre Bird," Creation/Ex Nihilo , 19:54, September-November 1997.) Comment. Woodcocks seem to lure worms to the surface in still another way: They "bob" or "rock" their body in a most peculiar manner. It is thought that the resulting pressure waves are transmitted to the ground through their feet and that these bring their favorite prey to where they can be grasped. (Marshall, William H.; "Does the Woodcock Bob ...
Terms matched: 2 - Score: 421 - 15 May 2017 - URL: /sf114/sf114p03.htm
... Science Frontiers ONLINE No. 136: JUL-AUG 2001 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Grunting Transcends Biological And Geographical Boundaries "Grunting for worms," that is. Birds are the most frequent worm-grunters; but reptiles do it (turtles, SF#65); and so do mammals (humans, SF#106). Grunting is an amusing and effective technique for luring earthworms to the surface where they can be consumed or used for fish bait. Animals usually grunt for worms by stomping on the ground after a rain. Just why the worms below rush to expose themselves upon detecting these seismic signals is known only to them. Perhaps they think more rain is falling or that a mole is burrowing toward them ... All we know is that grunting works. In the article under review, English seagulls are reported doing a flat-footed version of an Irish jig to entice their dinner to the surface. Oystercatchers, on the other hand, prefer a reel-like dance in which they cavort in circles and straight lines. Somehow, the grunting technique has been communicated to birds everywhere. Red-billed gulls in New Zealand grunt for worms, so do the olive thrushes of South Africa. (Smith, Richard Hoseason, et al; "Rain Dance," New Scientist, p. 102, May 12, 2001.) Comment. It is mildly anomalous that this unlikely hunting technique is found in so many places and employed by so many species. Our own research adds that strange New Caledonian ...
Terms matched: 2 - Score: 338 - 15 May 2017 - URL: /sf136/sf136p05.htm
... Harvey is a purist and eschews modern worm-catching technology, such as those popular iron stakes driven into the ground and connected to a car's battery. (Simmons, Morgan; "Making 'Music' with Saw and Stump," Knoxville News-Sentinel, April 21, 1996. Cr. J.A . Caywood) Comment. See SF#65 on how to "grunt" for worms with a driven stake and notched stick -- a variation of Harvey's technique. From Science Frontiers #106, JUL-AUG 1996 . 1996-2000 William R. Corliss ...
Terms matched: 2 - Score: 284 - 15 May 2017 - URL: /sf106/sf106p08.htm
... Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects The Wood Turtle Stomp J.H . Kaufmann is a zoologist with strong proclivities for wood-turtle watching. Not a very strenuous vocation you say! Be that as it may, wood turtles make up for their lack of speed with some interesting talents. Besides being able to home accurately over unfamiliar terrain, they also know how to "grunt" - not vocal grunting, but a much more curious activity. Kaufmann relates one of his observations: "I came upon an adult male. When I first saw him he was sitting quietly beside a creek, but he soon wandered into a damp thicket of alder, spicebush, and false hellebore. Before disappearing from sight, however, he began to rock back and forth. I ... rocking. First, I noticed that the rocking was caused by short bouts of stomping with the front feet, alternating between left and right. Then he suddenly jabbed his head at the ground and ate something. This behavior continued for a half hour, and several times I caught a glimpse of the prey - earthworms snatched from the surface. I suddenly realized the turtle was 'grunting' for worms!" Turtle preparing to stomp; i.e . 'grunt'. Earthworms, for reasons we cannot fathom, pop out of the ground and flee in panic when vibrations flood their milieu. The wood turtle has apparently learned how to take advantage of this weakness of worms. So have some gulls and plovers. In fact, some humans make their living grunting for earthworms. They ...
Terms matched: 2 - Score: 276 - 15 May 2017 - URL: /sf065/sf065b05.htm
... Science Frontiers ONLINE No. 98: Mar-Apr 1995 Issue Contents Other pages Home Page Science Frontiers Online All Issues This Issue Sourcebook Project Sourcebook Subjects Some Shaky Observations Back in SF#65, we offered an item on how wood turtles stomp the ground to force earthworms out of their burrows. (When humans do this -- and they do -- it is called "grunting for worms!) Other animals also use vibrations for communication and, rather surprisingly, for cutting leaves. Malaysian tree frogs. Zoologists already knew that Puerto Rican white-lipped frogs use vibrations to communicate amongst themselves. The Malaysian tree frog can now be added to the list of substrate vibrators. The female will sit on a reed or small sapling and tap out a "come-hither" message ... her toes. The message goes forth in minute seismic waves. The males detect these vibrations and proceed, sometimes in great numbers, to the source of the vibrations, and the species is thereby perpetuated. (Mestel, Rosie; "Courting Tree Frogs Make the Earth Move," New Scientist, p. 8, December 10, 1994.) Leaf-cutting ants. Leaf-cutting ants neatly excise penny-size pieces of leaves and tote them back to their fungus gardens. J. Tautz and colleagues, University of Wurtzburg, noted that the ants chirped as they sliced at the leaves with their jaws. With a little instrumentation, they discovered that during each chirp both ant and leaf vibrated at about 1,000 hertz. The vibration apparently rigidizes soft leaf tissues and makes ...
Terms matched: 2 - Score: 194 - 15 May 2017 - URL: /sf098/sf098b09.htm
... Science Frontiers ONLINE No. 114: Nov-Dec 1997 Other pages Home Page Science Frontiers Online All Issues Last Issue Next Issue Sourcebook Project Sourcebook Subjects Contents Archaeology Standing stones in north carolina? About as anomalous as mounds can get Astronomy It can't be true because it violates our ideas! Biology Do woodcocks "grunt" for worms? Gene wars Complexity and mount improbable Geology Surface life (us!) only a "special case" The world's largest "playa-slider" furrow Geophysics Mekong mystery Lightning strikes jet and possibl spawns ball lightning Psychology Redefining science Physics A RECIPE FOR WEIGHTLESSNESS? Quantum mechanics is definitely spooky Cold fusion not so hot! Unclassified The bermuda triangle is still spooky ...
Terms matched: 2 - Score: 194 - 15 May 2017 - URL: /sf114/index.htm
