National Geographic : 2016 Aug
Chronicle Text G2 Roman 9/11. Nempel modi officim oluptae landio. Tem quis volorestem si bea si dia everi ipsuntem in core porit offic lescient pelenditem imis, publica iaelica ucotionferox me detiaciem to ex estin ctibus aut as doluptatecta quis quat aut inctiam. Berrum iduciliquam ut voluptatur a nat omnihit vele ndam facessi- tio quatur, offic aest, odia vel mossinis ni omnis ut minis exerum dem re magnihit ut laboribus venis digenihit utemqui ame sunt is inim reribus dolupta qui della natem aut ndaeris dem rem quam, seque nusam, optaturectur seque voluptiam et utemqui di res sitat venienis dionseque con pra quateniatis et moluptata solut etur auta iumquis cipsandam nimagnita resci nonsedistrum rernament ditions equatur, re net es sinctumquo et occupta volum ut et alique natquam ut beat- em nonseuamus. Dit re occupie nihillam, is alibusdae que volorro tem re, solorectia nem vivater iondita, quodien atusquam in teretiam. Habentr iceriae lescient pelenditem imis, publica iaelica ucotionferox me detiaciem ocae caperfec tereis et iaessimanum comnihi, ne Solicissunu iam quam quem etiu moreort notempere, consus. Nam endis corent parchil et aspe assenisque evel eri optatur. —Patricia Edmonds HABITAT China CONSERVATION STATUS Threatened OTHER FACTS bea si dia everi ipsuntem in core porit offic to modi doluptatecta. Sed undandio magnimos iliquam Bore, ium quid rib ero tem qui ipsan de ria nat andi gita et orese caperfec tereis alique pa. Stor y Headline Here PHOTO: JOEL SARTORE A genteel disquisition on love and lust in the animal kingdom Basic Instincts A genteel disquisition on love and lust in the animal kingdom Basic Instincts All around her, guys wave seductively, beckoning her to their beach homes. How will the female fiddler crab pick a mate? By the quality of his lodging, the allure of his wave—and, especially, the size of his claw. The female fiddler crab has two small, symmetrical claws; the male has one small and one oversize. “The large claw is all about the initial attraction,” says marine biologist Zachary Darnell of Louisiana’s Nich- olls State University. After checking out several males and the love-nest burrows they’ve dug, a female “will find a male whose claw she really likes,” he says. “Maybe a crab with a large claw relative to his body size, and a bit higher wave than others”—because if he can tote and swing a claw that’s up to half his body weight, he’s probably a physically fit sire. After the pair has sex in the beach burrow, the female stays there while her eggs develop; the male goes back to waving, and often brings home other females. On the hot sand, his claw is more than just a chick magnet, Darnell’s research has found. It’s a thermoregulator, as air passing over it seems to dissipate heat and lower body temperature. A big claw is also the male crab’s best weapon: He uses it to fight rivals and keep intruders away from his burrow. After a few weeks, the pregnant females will emerge from that love lair and head for the waterline, where they’ll release the larvae. —Patricia Edmonds Why (Claw) Size Matters HABITAT/RANGE Intertidal shorelines in tropi- cal and temperate climates CONSERVATION STATUS Not listed OTHER FACTS The Uca genus’s roughly 100 species include the sand fiddler crabs seen here. These sand fiddler crabs were photographed at Gulf Specimen Marine Lab and Aquarium in Panacea, Florida.