Some animals, such as the kangaroo, employ jumping (commonly called hopping in this instance) as their primary form of locomotion, while others, such as frogs, use it only as a means to escape predators. Jumping is also a key feature of various activities and sports, including the long jump, high jump and show jumping.

All jumping involves the application of force against a substrate, which in turn generates a reactive force that propels the jumper away from the substrate. Any solid or liquid capable of producing an opposing force can serve as a substrate, including ground or water. Examples of the latter include dolphins performing traveling jumps, and Indian skitter frogs executing standing jumps from water.


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Jumping organisms are rarely subject to significant aerodynamic forces and, as a result, their jumps are governed by the basic physical laws of ballistic trajectories. Consequently, while a bird may jump into the air to initiate flight, no movement it performs once airborne is considered jumping, as the initial jump conditions no longer dictate its flight path.

Mechanical power (work per unit time) and the distance over which that power is applied (e.g., leg length) are the key determinants of jump distance and height. As a result, many jumping animals have long legs and muscles that are optimized for maximal power according to the force-velocity relationship of muscles. The maximum power output of muscles is limited, however. To circumvent this limitation, many jumping species slowly pre-stretch elastic elements, such as tendons or apodemes, to store work as strain energy. Such elastic elements can release energy at a much higher rate (higher power) than equivalent muscle mass, thus increasing launch energy to levels beyond what muscle alone is capable of.

Animals use a wide variety of anatomical adaptations for jumping. These adaptations are exclusively concerned with the launch, as any post-launch method of extending range or controlling the jump must use aerodynamic forces, and thus is considered gliding or parachuting.

Aquatic species rarely display any particular specializations for jumping. Those that are good jumpers usually are primarily adapted for speed, and execute moving jumps by simply swimming to the surface at a high velocity. A few primarily aquatic species that can jump while on land, such as mud skippers, do so via a flick of the tail.

In terrestrial animals, the primary propulsive structure is the legs, though a few species use their tails. Typical characteristics of jumping species include long legs, large leg muscles, and additional limb elements.

Long legs increase the time and distance over which a jumping animal can push against the substrate, thus allowing more power and faster, farther jumps. Large leg muscles can generate greater force, resulting in improved jumping performance. In addition to elongated leg elements, many jumping animals have modified foot and ankle bones that are elongated and possess additional joints, effectively adding more segments to the limb and even more length.

Grasshoppers use elastic energy storage to increase jumping distance. Although power output is a principal determinant of jump distance (as noted above), physiological constraints limit muscle power to approximately 375 Watts per kilogram of muscle.[2] To overcome this limitation, grasshoppers anchor their legs via an internal "catch mechanism" while their muscles stretch an elastic apodeme (similar to a vertebrate tendon). When the catch is released, the apodeme rapidly releases its energy. Because the apodeme releases energy more quickly than muscle, its power output exceeds that of the muscle that produced the energy.

This is analogous to a human throwing an arrow by hand versus using a bow; the use of elastic storage (the bow) allows the muscles to operate closer to isometric on the force-velocity curve. This enables the muscles to do work over a longer time and thus produce more energy than they otherwise could, while the elastic element releases that work faster than the muscles can. The use of elastic energy storage has been found in jumping mammals as well as in frogs, with commensurate increases in power ranging from two to seven times that of equivalent muscle mass.[3]

It is also noted that jumping development in children has a direct relationship with age. As children grow older, it is seen that their jumping abilities in all forms also increase. Jumping development is more easily identifiable in children rather than adults due to the fact that there are less physical differences at a younger age. Adults of the same age may be vastly different in terms of physicality and athleticism making it difficult to see how age affects jumping ability.[13]

Drawing from the historical records of enslaved people in the United States, British Romani, Louisiana Cajuns, and many others, Parry discloses how marginalized people found dignity in the face of oppression by innovating and reimagining marriage rituals. Such innovations have an enduring impact on the descendants of the original practitioners. Parry reveals how and why the simple act of "jumping the broom" captivates so many people who, on the surface, appear to have little in common with each other. About the Author Tyler D. Parry is assistant professor of African American and African diaspora studies at the University of Nevada, Las Vegas. 

For more information about Tyler D. Parry, visit the Author Page.

The lens is a Macro with IS. What diverhank and ebiggs1 state is true. If its jumping with IS turned off and pressing the shutter (halfway) or BBF, thats not a good sign. I'd wipe the contacts gently with Qtip and alcohol. Ensure its thoroughly dry and remount. If it continues, you know it has a visit to Canon's NorthPole Christmas Repair factory in its future. Good Luck

No earthworms are native to Minnesota and other northern states. Jumping worms are native to Asia. People spread jumping worms throughout North America by moving potted plants, soil, compost, mulch and fishing bait.

Researchers at the University of Minnesota have confirmed jumping worms in Minnesota. Dr. Lee Frelich first observed Amynthas agrestis in Loring Park in Minneapolis in 2006. Dr. Frelich has also observed jumping worms on the University of Minnesota St. Paul campus since 2007.

To prevent future introductions of jumping worms (Amynthas species), the DNR is considering listing Amynthas species as prohibited invasive species in Minnesota. This would make it a misdemeanor to possess, import, purchase, transport or introduce jumping worms without a permit.

Preventing the introduction and spread of jumping worms in Minnesota is more effective than controlling established populations. Do not purchase or import jumping worms, and remember to inspect mulch, plants, soil and bait for jumping worms.

There are no known methods for controlling invasive earthworms on a large scale in natural settings. Chemical treatments that would kill earthworms would kill beneficial soil organisms as well. Jumping worms live near the top of the soil surface and in the leaf and mulch layer. You can hand collect worms, seal them in a bag, and dispose of them in the trash. This may help reduce the amount of jumping worms at your site.

Gardeners have many questions about how the timing of gardening activities or how various soil amendments or mulches affect jumping worms. There may be garden management techniques that reduce the impacts of jumping worms, but we have little information on this. University of Minnesota Extension has collected gardener experiences and summarized the results on the Report Jumping Worm Management webpage.

I too have been having the issue of the display jumping to the end of the file, even though the cursor stays at the data inputting location. I get around this bug by selecting the keyboard settings, Samsung Keyboard, hit the gear, turn OFF Predictive text. I like predictive text for other apps though so have to keep turning it back on after using Simplenote, several times a day. No problems with the Windows app, the browser version, or an Android Samsung S22 Note. Love Simplenote so have been dealing with this for about a year.

Endemic to parts of Asia, jumping worms (Amynthas spp.) first arrived in North America sometime in the late 19th century, probably in imported plants and other horticultural and agricultural materials. Since then, jumping worms have become widespread across much of the northeast, southeast and midwestern U.S. In 2013, jumping worms were confirmed for the first time in the upper Midwest, at the University of Wisconsin-Madison Arboretum.

Surprisingly, all earthworms in Wisconsin are non-native. There have been no native earthworms in Wisconsin since the last glacier moved through the state thousands of years ago, scouring the landscape down to the bedrock. The familiar earthworms we see in our gardens and on our fishing hooks originated in Europe, brought here by settlers. Although all earthworms can harm landscapes and forests, jumping worms may pose a bigger threat than European worms.

Jumping worms can quickly transform soil into dry, granular pellets with a texture like discarded coffee grounds. This altered soil structure is often unaccommodating to ornamental and garden plants and inhospitable to many native plant species. In addition, they can deplete the soil of nutrients, impact soil organisms, and in many cases, invasive plants thrive where jumping worms live.

Unlike most other kinds of earthworms, jumping worms are parthenogenic - they self-fertilize and do not need mates to reproduce. Each new generation begins with the production of hardened egg capsules, known as cocoons, that overwinter in the soil to hatch the following spring. Jumping worm cocoons are resistant to cold and drought and are as tiny as mustard seeds. Since they greatly resemble small bits of dirt, they are hard to see and so are often unknowingly moved in soil, mulch, potted plants, etc. 006ab0faaa

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