Praying Mantis Sex and Cannibalism

Praying Mantis Sex and Cannibalism The female praying mantis is often painted as an evil seductress, a cannibalistic lover that lures males closer, only to eat them after mating. Is her reputation deserved? Does praying mantis sex always end in cannibalism of the male? Female Mantis Shaming or Truth? Rumors of the praying mantis cannibalistic tendencies began when scientists observed their mating behavior in a laboratory environment. Entomologists would offer a captive female a potential mate and would quite often be horrified to watch the female bite the head or legs off the smaller male- sometimes even before mating. After the male had served his copulatory purpose, he was nothing more than a good meal for the female and her upcoming offspring. For a long time, these observations of praying mantis sex in the lab were thought to be the way things were in the mantid world.   Much Less Common in the Wild After scientists started observing praying mantis sex in a natural setting, the story had a different ending, which is good for the males. When unconfined by laboratory terrariums (and not starving), the majority of praying mantis mating ends with the male flying off unharmed. By most estimates, sexual cannibalism by praying mantis females occurs less than 30 percent of the time outside the lab. Those are better odds for the fellows than what had been seen in the lab. Praying mantis sex, it turns out, is really a rather romantic series of courtship rituals and dances that typically ends satisfactorily and safely for both parties involved. How Males Choose Females Given a choice between females, male praying mantises will move toward females seen as less aggressive (i.e., ones they hadnt just seen eating another male) more often than the more aggressive females. The males also tend to prefer to mate with females that appear fatter and more well fed than others, as the skinnier and hungrier mantises are more likely to eat their mates during or after sex. This could also point to the males being more attracted to females that are healthier, for the betterment of their offspring.   Advantages of Beheading Your Mate There is a decided advantage for the female if she does decide to behead her lover. The praying mantis brain, located in his head, controls inhibition, while a ganglion in the abdomen controls the motions of copulation. Absent his head, a male praying mantis will lose all his inhibitions and consummate his relationship with wild abandon. And what if shes hungry? For certain, a slow-moving and deliberate predator like the praying mantis is not going to pass up an easy meal. If a male makes the unfortunate choice of a hungry female for a mate, hes probably going to be toast after theyve mated. Either Way Could Benefit the Males A twist: Being eaten by the female paradoxically may mean that that particular male has more of his genetics making it to the next  generation  if more of his sperm fertilize his mates eggs while she is eating parts of him. More eggs are laid by females who eat their mates as well (88 vs. 37.5 in one study). However, if a male can mate more than once, that also increases his odds of having his genetics passed on.

Battle of Resaca de la Palma - Mexican-American War

Battle of Resaca de la Palma - Mexican-American War Battle of Resaca de la Palma - Dates Conflict: The Battle of Resaca de la Palma was fought May 9, 1846, during the Mexican-American War (1846-1848). Armies Commanders Americans Brigadier General Zachary Taylor2,222 menMexicansGeneral Mariano Aristaapprox. 4,000-6,000 men Battle of Resaca de la Palma - Background: Having been defeated at the Battle of Palo Alto on May 8, 1846, Mexican General Mariano Arista elected to withdraw from the battlefield early the next morning. Retreating down the Point Isabel-Matamoras road, he sought to prevent Brigadier General Zachary Taylor from advancing to relieve Fort Texas on the Rio Grande. In looking for a position to make a stand, Arista sought terrain which would negate Taylors advantage in light, mobile artillery which had played a critical role in the previous days fighting. Falling back five miles, he formed a new line at Resaca de la Palma (Resaca de la Guerrero) (Map). Here the road was hemmed in by thick chaparral and trees on either side which would negate the American artillery while providing cover for his infantry. In addition, where the road cut through the Mexican lines, it passed through a ten-foot deep, 200-foot wide ravine (the resaca). Deploying his infantry into the chaparral on either side of the resaca, Arista placed a four-gun artillery battery across the road, while holding his cavalry in reserve. Confident in the disposition of his men, he retired to his headquarters in the rear leaving Brigadier General RÃ ³mulo DÃ ­az de la Vega to oversee the line. Battle of Resaca del Palma - The Americans Advance: As the Mexicans departed Palo Alto, Taylor made no immediate effort to pursue them. Still recovering from the May 8 fight, he also hoped that additional reinforcements would join him. Later in the day, he elected to push forward but decided to leave his wagon train and heavy artillery at Palo Alto to facilitate more rapid movement. Advancing along the road, the lead elements of Taylors column encountered the Mexicans at Resaca de la Palma around 3:00 PM. Surveying the enemy line, Taylor immediately ordered his men forward to storm the Mexican position (Map). Battle of Resaca de la Palma - The Armies Meet: In an attempt to repeat the success of Palo Alto, Taylor ordered Captain Randolph Ridgely to move forward with the artillery. Advancing with skirmishers in support, Ridgelys gunners found it slow going due to the terrain. Opening fire, they had difficulty spotting targets in the heavy brush and were nearly overrun by a column of Mexican cavalry. Seeing the threat, they switched to canister and drove off the enemy lancers. As the infantry advanced through the chaparral in support, command and control became difficult and the fighting quickly degenerated into a series of close-quarter, squad-sized actions. Frustrated by the lack of progress, Taylor ordered Captain Charles A. May to charge the Mexican battery with a squadron from the 2nd US Dragoons. As Mays horsemen moved forward, the 4th US Infantry began probing Aristas left flank. Surging down the road, Mays men succeeded in overrunning the Mexican guns and inflicted losses among their crews. Unfortunately, the momentum of the charge carried the Americans a quarter mile further south allowing the supporting Mexican infantry to recover. Charging back north, Mays men were able to return to their own lines, but failed to retrieve the guns. Though the guns had not been seized, Mays troopers succeeded capturing Vega and several of his officers. With the Mexican line leaderless, Taylor promptly ordered the 5th and 8th US Infantry to complete the task. Advancing towards the resaca, they launched into a determined fight to take the battery. As they began to drive back the Mexicans, the 4th Infantry succeeded in finding a path around Aristas left. Lacking leadership, under heavy pressure on their front, and with American troops pouring into their rear, the Mexicans began to collapse and retreat. Not believing that Taylor would attack so soon, Arista spent most of the battle in his headquarters. When learning of the 4th Infantrys approach, he raced north and personally led counterattacks to halt their advance. These were repulsed and the Arista was forced to join the general retreat south. Fleeing the battle, many Mexicans were captured while the remainder re-crossed the Rio Grande. Battle of Resaca de la Palma - Aftermath: The fighting for the resaca cost Taylor 45 killed and 98 wounded, while Mexican losses totaled around 160 killed, 228 wounded, and 8 guns lost. Following the defeat, Mexican forces re-crossed the Rio Grande, ending the siege of Fort Texas. Advancing to the river, Taylor paused until crossing to capture Matamoras on May 18. Having secured the disputed territory between the Nueces and Rio Grande, Taylor halted to await further reinforcements before invading Mexico. He would resume his campaign that September when he moved against the city of Monterrey. Selected Sources Palo Alto Battlefield National Historical Park: Resaca de la PalmaHandbook of Texas: Battle of Resaca de la PalmaUS Army Center for Military History: Guns Along the Rio GrandeTrudeau, Noah Andre. A Band of Demons Fights for Texas. Military History Quarterly Spring 2010: 84-93.