5/18/2023 0 Comments Leopard frog dissection![]() We show here that adhesive strength alone is not the most accurate indicator of stickiness. In the animal kingdom, these values are not the highest: the leaf beetle and Tokay gecko have adhesive strengths of 16.5 kPa and 100 kPa, respectively. Kleinteich & Gorb were the first to measure the frog tongue retraction force in the horned frog Ceratophrys cranwelli the average adhesive strength was with a maximum recorded adhesive strength of 17.7 kPa. Even then, Waller was fascinated by the soft, sticky nature of the frog tongue: ‘The attention of physiologists was first directed by me to the peculiar advantages possessed by the tongue of the living frog … the extreme elasticity and transparency of this organ induced me to submit it to the microscope’. Little is known about the underlying physics that makes the tongue so sticky.įrog studies date back to the 1800s, when Augustus Waller published a paper on the frog tongue nerves and papillae. One may think that the frog tongue succeeds in capturing only lightweight prey however, the frog tongue can pull up to 1.4 times the frog's body weight. There is no known commercial mechanism that can match the grabbing speed of the frog tongue, let alone adhere to a highly textured surface like a fly. How can a frog grab a flying insect using just its tongue? There are over 4000 species of frog and toad that use a sticky, whip-like tongue to grab prey faster than a human can blink. These principles may inspire the design of reversible adhesives for high-speed application. ![]() This combination of properties gives the tongue 50 times greater work of adhesion than known synthetic polymer materials such as the sticky-hand toy. The shear-thinning saliva spreads over the insect during impact, grips it firmly during tongue retraction, and slides off during swallowing. The tongue acts like a car's shock absorber during insect capture, absorbing energy and so preventing separation from the insect. We show that the tongue's unique stickiness results from a combination of a soft, viscoelastic tongue coupled with non-Newtonian saliva. How can the frog tongue be so sticky? In this combined experimental and theoretical study, we perform a series of high-speed films, material tests on the tongue, and rheological tests of the frog saliva. “Frog in hand.” Cheboygan State Park.Frogs can capture insects, mice and even birds using only their tongue, with a speed and versatility unmatched in the world of synthetic materials."Northern Leopard Frog Rocky Mountain population." Species at Risk."Bringing threatened frogs back to southern Alberta wetlands After 35 year hiatus, Northern Leopard frogs return to Pincher Creek area park." M2 Presswire 31 Aug.The last time this frog had been seen there was 1974! (Bringing) Photo #1 Photo #2 In 2009, the Government of Alberta released 11,000 frogs back into a Provincial park.Prefer grassy areas near water (Northern).Note: this is a NUMERICAL list – just put the photos in numbered order “Side profile frog.” Nova Scotia Frogs. ![]() List of Images Used Name of the web site where the photo is posted – NOT Google images! Give your photo a descriptive title URL of the web site The last time this frog had been seen there was 1974! (Bringing) Photo #2 ![]() The Northern Leopard Frog Number your photos in the bottom right corner Photo #1 Green with dark spots Prefer grassy areas near water (Northern) In 2009, the Government of Alberta released 11,000 frogs back into a Provincial park. "Northern Leopard Frog Rocky Mountain population." Species at Risk. Works Cited Alphabetical order – Bringing comes before Northern "Bringing threatened frogs back to southern Alberta wetlands After 35 year hiatus, Northern Leopard frogs return to Pincher Creek area park." M2 Presswire 31 Aug. The Northern Leopard Frog Photo #1 Everyone can see this, so no reference necessary Refers to source whose citation begins with Northern Green with dark spots Prefer grassy areas near water (Northern) In 2009, the Government of Alberta released 11,000 frogs back into a Provincial park.
0 Comments
Leave a Reply. |