Theyhave a prettycompellingreasonforthisunusualbehavior.
Prayingmantisesaresoincredible, researchersputthemin a categoryoftheirownamonginsects, comparingthemmorecloselytovertebratesthantheirinsectcounterparts.
Researchersfoundthatwingless, juvenilethorny-armedprayingmantisescanjumpfrom a horizontalsurfaceto a verticalone, twobodylengthsaway, withnearly 100% accuracy.
Andbecausetheyaresit-and-waitpredators, for a longtime, scientiststhoughtthattheirattackswerestereotypical, meaningthateachprayingmantisstrikewouldalwaysbetheinthesamedirection, atthesameangle, atthesamespeed.
I mean, ifyouthinkabouttheirforelegs, there's threesegmentsthatthey'removingtocapturetheprey, butthere's a lotofpotentialversatilityinhowtheymovethat, howfast, howmuch.
Prayingmantidscanoftenbeseenperchedonhummingbirdfeeders, watchingcarefullyas a hummingbirdhoversnearthesugarywater.
When a birdcomeswithinstrikedistance, usually 5 to 10 centimeters, themantisquicklystrikeswithitstworaptorialfrontlegswhileholdingontoitsperchwithitsotherfourlegs.
Butitdoessuggestthattheylikelyareproducingsomeamountofforce, a significantamountofforce, astheysortofclosethosetibiaonthosefemurstobeabletoholdontothispreyandeatitbasicallyalive.
Andyousay, OK, nowthecorrelationisatitspeakandthat's wheretheimagesmatchAndwiththatoffset, I cansaythelefteyematchestherighteyeandnow I canfigureouthowfarawaysomethingis.
Thisis a particularlyreliablemeansofdepthperceptionbecauseitdependsonlyongeometryratherthanonassumptions.
Whenitwasfirstdescribed, scientistsbelievedonlyprimatesandothermammalswithlargebrainsandfront-facingeyeswerecapableofit, sinceitrequires a lotofbrainpower.
Theseprismsincreasedthehorizontaldisparitybetweentheeyes, meaningtheyshiftedtheviewofeachofthem a littlebitinward, artificiallyplacingtheflyclosertothemantisin 3D space.
Theygavetheprayingmantisspecial 3D glassesandputitin a mantiscinema.
Wedidn't usered-blue 3D glassesliketheold-styleonesyougetforhumansbecauseinsectstypicallydon't seeredlight, soweusedblueandgreenlight.
Inthismantiscinema, theyshowedthemantis a movieofprey, blackandwhitedotshoveringrightinfrontofthemantis, whereeacheyesaw a slightlyshiftedversionfromtheothereyeduetothe 3D glasses.
I thinkinmachinevision, we'realwaysusingthehumanas a goldstandard, andlike, canmycomputeralgorithmreproducetheabilitiesofhumanstereoscopicvision, whichmaybeveryappropriate, butitmaybemassivelyover-engineeredforwhatyouneed.
Thestudyauthorhypothesizedthatthiswasbecausethefemaleswhowereeffectivelystarvingputalloftheirenergytowardspheromonessothattheywouldattractthemalesandthenget a chancetoeatthem.
Whichgivesthefemale a lotoftimetoattackifshe's feelingsnacky.
Socaloriesreallyseemtobethemainmotivatorforthefemales, althoughscientistsspeculatethatsometimesthefemalesattackbecausethey'renotyetsexuallymaturewhenthemalesapproachthem, whichis a tactic I thinkhumansshouldemploytoo.
And I alwaysthought, thankGod I'm massivelybiggerthanthistinyinsect, anditcan't actuallyattackmeandeatme.
Soyes, definitelyboth.
Luckily, gettingtheopinionsofbothChrisandJennyhelpedmesee a fullerpictureoftheprayingmantis, aninsect I'velovedfrom a distancefor a longtime, butonethatthey'vededicatedyearsoftheirlifetounderstanding.
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