Wavy facial hair helps seals find food

first_imgBlindfold a harbor seal, clap headphones on its ears, and the keen hunter will still be able to track a distant fish, using its whiskers to detect the ripples made by its prey. Now, scientists have figured out the secret to the whiskers’ remarkable sensitivity: their wavy shape. To simulate a whisker on a swimming seal, the researchers made a model hair and dragged it through a tank of water. A simple cylindrical whisker would have flopped around violently, much like the antenna on the hood of car does in the wind. But the curvy whisker model with its ellipse-shaped cross section barely wiggled, suggesting that the whiskers of a seal tearing through water at top speed would stay relatively still, the researchers report this month in a paper posted to the arXiv preprint server. Only when a second object was introduced into a tank, a simulated fish, did the model begin to twitch significantly. It vibrated in sync with swirls of water shed by the fake prey, sliding like a skier on a slalom course from vortex to vortex. Able to efficiently harness the energy of the whirlpools, the shapely whisker was set in motion even by slow-moving eddies generated by a faraway “fish.”(Linked photo credit: T.C. Murphy et al., PLOS ONE 8, 7 [2013])Sign up for our daily newsletterGet more great content like this delivered right to you!Country *AfghanistanAland IslandsAlbaniaAlgeriaAndorraAngolaAnguillaAntarcticaAntigua and BarbudaArgentinaArmeniaArubaAustraliaAustriaAzerbaijanBahamasBahrainBangladeshBarbadosBelarusBelgiumBelizeBeninBermudaBhutanBolivia, Plurinational State ofBonaire, Sint Eustatius and SabaBosnia and HerzegovinaBotswanaBouvet IslandBrazilBritish Indian Ocean TerritoryBrunei DarussalamBulgariaBurkina FasoBurundiCambodiaCameroonCanadaCape VerdeCayman IslandsCentral African RepublicChadChileChinaChristmas IslandCocos (Keeling) IslandsColombiaComorosCongoCongo, The Democratic Republic of theCook IslandsCosta RicaCote D’IvoireCroatiaCubaCuraçaoCyprusCzech RepublicDenmarkDjiboutiDominicaDominican RepublicEcuadorEgyptEl SalvadorEquatorial GuineaEritreaEstoniaEthiopiaFalkland Islands (Malvinas)Faroe IslandsFijiFinlandFranceFrench GuianaFrench PolynesiaFrench Southern TerritoriesGabonGambiaGeorgiaGermanyGhanaGibraltarGreeceGreenlandGrenadaGuadeloupeGuatemalaGuernseyGuineaGuinea-BissauGuyanaHaitiHeard Island and Mcdonald IslandsHoly See (Vatican City State)HondurasHong KongHungaryIcelandIndiaIndonesiaIran, Islamic Republic ofIraqIrelandIsle of ManIsraelItalyJamaicaJapanJerseyJordanKazakhstanKenyaKiribatiKorea, Democratic People’s Republic ofKorea, Republic ofKuwaitKyrgyzstanLao People’s Democratic RepublicLatviaLebanonLesothoLiberiaLibyan Arab JamahiriyaLiechtensteinLithuaniaLuxembourgMacaoMacedonia, The Former Yugoslav Republic ofMadagascarMalawiMalaysiaMaldivesMaliMaltaMartiniqueMauritaniaMauritiusMayotteMexicoMoldova, Republic ofMonacoMongoliaMontenegroMontserratMoroccoMozambiqueMyanmarNamibiaNauruNepalNetherlandsNew CaledoniaNew ZealandNicaraguaNigerNigeriaNiueNorfolk IslandNorwayOmanPakistanPalestinianPanamaPapua New GuineaParaguayPeruPhilippinesPitcairnPolandPortugalQatarReunionRomaniaRussian FederationRWANDASaint Barthélemy Saint Helena, Ascension and Tristan da CunhaSaint Kitts and NevisSaint LuciaSaint Martin (French part)Saint Pierre and MiquelonSaint Vincent and the GrenadinesSamoaSan MarinoSao Tome and PrincipeSaudi ArabiaSenegalSerbiaSeychellesSierra LeoneSingaporeSint Maarten (Dutch part)SlovakiaSloveniaSolomon IslandsSomaliaSouth AfricaSouth Georgia and the South Sandwich IslandsSouth SudanSpainSri LankaSudanSurinameSvalbard and Jan MayenSwazilandSwedenSwitzerlandSyrian Arab RepublicTaiwanTajikistanTanzania, United Republic ofThailandTimor-LesteTogoTokelauTongaTrinidad and TobagoTunisiaTurkeyTurkmenistanTurks and Caicos IslandsTuvaluUgandaUkraineUnited Arab EmiratesUnited KingdomUnited StatesUruguayUzbekistanVanuatuVenezuela, Bolivarian Republic ofVietnamVirgin Islands, BritishWallis and FutunaWestern SaharaYemenZambiaZimbabweI also wish to receive emails from AAAS/Science and Science advertisers, including information on products, services and special offers which may include but are not limited to news, careers information & upcoming events.Required fields are included by an asterisk(*)last_img read more

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Derrick Hall satisfied with Dbacks buying and se

first_img Derrick Hall satisfied with D-backs’ buying and selling “He’s a great leader for us.”Though it would be unwise to try to take too much away from just one game, it does appear that the Cardinals’ offense is very much improved from last year. Now, the only question is whether or not that will translate to more wins. – / 27 Top Stories Former Cardinals kicker Phil Dawson retires Comments   Share   “Coach Arians’ offense is unbelievable,” Cardinals receiver Larry Fitzgerald told ESPN’s SportsCenter Tuesday. “He has so many different ideas and formations, and puts guys in position to have success.”Fitz himself had an outstanding day, catching eight passes for 80 yards and two touchdowns, but Andre Roberts (8 catches, 97 yards) and Michael Floyd (four catches, 82 yards) also got in on the fun. In all, eight different Cardinals caught a pass. “He knows what guys’ strengths are,” Fitzgerald added. “He’s going to put you in position to go out there and play at your best and play fast.”Arians’ play-calling aside, it’s tough to see the Cardinals being as effective without the change at quarterback. While the veteran did throw an interception, he was on target much of the day and showed why the team acquired him from the Oakland Raiders.“It’s great to have that stabilizing figure at the quarterback position,” Fitzgerald said, adding Palmer brings a calming presence to the huddle. “He’s poised, and to have that, you know you have an opportunity to go out there and have success every single Sunday. The 5: Takeaways from the Coyotes’ introduction of Alex Meruelo The Arizona Cardinals did not win their season opener, but that does not mean the afternoon was a total loss.Sure, the team has every reason to be disappointed in the 27-24 loss to the St. Louis Rams, but there were some positives to take away from the game, especially on the offensive side of the ball.New quarterback Carson Palmer looked sharp running new coach Bruce Arians’ offense, and the Cardinals piled up 390 yards of total offense against one of the better defenses in the league. Grace expects Greinke trade to have emotional impactlast_img read more

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