MindanaoMimics
There’saspeciesofjewelweevilcalledPachyrhynchusreicherti.Ithasablackandspottedbody.Itselytraarejoinedtogether.It’stootoughtobitethrough.Itsstrongcolorsandmarkingstellpredatorstostay away.
WhenCabrasfirstspottedanewspecies,Metapocyrtuswillietorresi,shethoughtitwasPachyrhynchusreicherti.Ithassimilarcolorsandmarkings.Ithasatough,joinedelytra.Neitherbeetlewouldmakeagoodmeal.So,whywasonecopyingthe other?
It’scalledMüllerianmimicry.That’swhentwoequallyharmfulthingshavedevelopedtolooklikeeachother.Theysendclearsignalstopredatorstostay away.
Pachyrhynchus reicherti
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957849/.Ann_Cabras___Metapocyrtus_willietorresi.mp4.640_0_1.jpg)
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957883/.Ann_Cabras___Metapocyrtus_willietorresi_transition.mp4.640_0_1.jpg)
Metapocyrtus willietorresi
Athirdbeetle,Doliopsdaugavpilsi,looksalotliketheothertwo.Butit’salonghornbeetle.Ithasasoftshellthatpredatorscouldbitethrough.Byhavingcolorsandpatternssimilartotheweevils,thelonghornstayssafe.Itkeepspredatorsawaybylookingdangerous.ThisisBatesian mimicry.
HereareafewexamplesofthebeetlesCabrassawduringherfieldworkonMindanao.Themimicsstronglyresembletheir models.
MODEL
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957840/NGX0121_EE_09Ajpg.480_0_1.jpg)
Model: Metapocyrtus kitangladensis
MIMIC
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957841/NGX0121_EE_09B.480_0_1.jpg)
Mimic: Coptorhynchussp.
MODEL
Model: Pachyrhynchus tikoi
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957843/NGX0121_EE_09C.480_0_1.jpg)
MIMIC
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957842/NGX0121_EE_09D.480_0_1.jpg)
Mimic: Metapocyrtussp.
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957844/Group_4.640_0_1.png)
Totestahypothesis,Cabrasusedfakebeetlesmadeofmodelingclay,liketheoneshownhere.Shewantedtoseeifpredatorswouldreacttothebeetle’swarning colors.
TestingaTheory
Cabraswonderedifshewastheonlyonebeingfooledbythesemimics.Shetriedanexperiment.Shemadefakebeetlesfrommodelingclay.TheylookedlikePachyrhynchusreicherti.Shesetthemoutinplaceswherethebeetleswerecommon.Shesetthemoutinplaceswheretheywerenotcommon.Thenshesetup cameras.
Wherethebeetleswerecommon,predatorsstayedawayfromtheclay beetles.Theyknewwhatthecolorsandpatternsmeant.Intheplaceswherethebeetleswerenotcommon,predatorstriedtoattack.Theyhadnotyetlearnedtostay away.
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957845/Ann_Cabras___Camera_trap.640_0_1.jpg)
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957848/Doliops_geometrica.240_0_1.png)
acamera trap
![](/nationalgeographic/trailblazer_january_february_2021/waiting_to_be_discovered_4/957846/Ann_Cabras___Mt__Parker_campsite.512_0_1.jpg)
InMindanao,therecouldbemanynewspeciesto discover.
Cabrasstillhasmanyquestions.ButlandonMindanaoisbeingclearedawayforfarmingandhouses.Inafewyears,shemightnotbeabletofindthesebeetlesintheirnaturalhabitat.Sofornow,hereyesaretrainedon them.