Fiddler crabs live on land in the Pacific Ocean, the South Atlantic Ocean, and the Mediterranean (McLain 2010). There are over 100 species and range in size from 2.5 to 5 cm wide (McLain 2010). Both claws of females are small, but one of the claws of males becomes considerably larger and can weigh up to half their body (Murai 2009). Adults will continue to grow by molting as they age (McLain 2010). The male will use his overgrown claw as a sign of strength and health, but some male fiddler crabs can simulate a large claw and gain the same benefits even though it is actually weak (Murai 2009). The size of the male's claw varies depending on how much nutrients and food are found in its habitat and how much it is able to eat (McLain 2010). The fiddler crab's diet consists of algae, bacteria, decaying plants, animal matter, and fungi (McLain 2010). They try to eat in puddles to make it easier to separate the food from the dirt (McLain 2010). The female crab uses both claws to feed while the male can only use his small claw, making feeding more difficult (McLain 2010). Male crabs fight over territory for resources (McLain 2010). Before fighting, males display their large claws and if neither backs down, they fight (Hirose 2010). In most fights, they fight for show and are rarely injured (Hirose 2010). If they happen to lose their large claw during a fight or if it is lost to a predator, the small claw will begin to grow while the other one regenerates (Murai 2009). The new claw will grow to resemble the old one, but some males can manipulate its growth and grow a new claw that resembles the original but uses fewer nutrients to produce because it is lighter and toothless (Murai 2009). This false claw is us... middle of paper ...... or they simply cannot find large portions of food to regrow or support a large claw (McLain 2010). Females are attracted to males with large, healthy claws (Muramatsu 2001). According to natural selection, males unable to lead a healthy life will not reproduce (Muramatsu 2001). Some of these crabs that fall on hard times will be so desperate to succeed that they will develop a false claw that costs less resources to grow/maintain and looks exactly like a normal claw, except that it is more light, has no teeth and is weaker (McLain 2010). Neither men nor women will know the difference (Murai 2009). Other males will respect him for having a stronger claw and females will be attracted to him for having a better wave/mating ritual (Murai 2009). These crabs fool natural selection by feigning their superiority, making natural selection irrelevant (Murai 2009).