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In between, plovers and other shorebirds, freshwater fish including crappies, and the larvae of coccinellid beetles (ladybirds), alternate between actively searching and scanning the environmeoss regularly flies hundreds of kilometres across the nearly empty ocean to find patches of food. Prey distributions are often clumped, and predators respond by looking for patches where prey is dense and then searching within patches.[24] Where food is found in patches, such as rare shoals of fish in a nearly empty ocean, the search stage requires the predator to travel for! a substantial time, and to expend a significant amount of energy, to locate each food patch.[32] For example, the black-browed albatross regularly makes foraging flights to a range of around 700 kilometres (430 miles), up to a maximum foraging range of 3,000 kilometres (1,860 miles) for breeding birds gathering food for their young.[a][33] With static prey, some predators can learn suitable patch locations and return to them at intervals to feed.[32] The optimal foraging strategy for search has been modelled using the marginal value theoen appear random. One such is the Lévy walk, that tends to involve clusters of short steps with occasional long steps. It is a good fit to the behaviour of a wide variety of organisms including bacteria, honeybees, sharksmals that capture prey by stealth or surprise. In animals, ambush predation is characterized by the predator's scanning the environment from a concealed position until a prey is spotted, and then rapidly executing a fixed ! surprise attack.[40][39] Vertebrate ambush predators include frogs, fish such as the angel shark, the northern pike and the eastern frogfish.[39][41][42][43] Among the many invertebrate ambush predators are trapdoor spiders on land and mantis shrimps in the sea.[40][44][45] Ambush predators often construct a burrow in which to hide, improving concealment at the cost of reducing their field of vision. Some ambush predators also use lures to attract prey within strikinds select plants of good quality for their aedator must decide whether to pursue it or keep searching. The decision depends on the costs and benefits involved. A bird foraging for insects spends a lot of time searching but capturing and eating them is quick and easy, so the efficient strategy for the bird is to eat every palatable insect it finds. By contrast, a predator such as a lion or falcon finds its prey easily but capturing it requires a lot of effort. In that case, the predator is more selectrs to consider is size. Prey that is too small may not be worth the trouble for the! amount of energy it provides. Too large, and it may be too difficult to capture. For example, a mantid captures prey with its forelegs and they are optimized for grabbing prey of a certain size. Mantids are reluctant to attack prey that is far from that size. There is a positive correlation between the size of a predator and its pss a patch and decide whether to spend time searching for prey in it.[24] This may involve some knowledge of the preferences of the prey; for example, ladybirds can choose a patch of vegetation suit