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The heat is on for lizards!
Russell Grenning
It nowseemsthatJimMorrison,the leadsingerforThe Doors,was literallytrue whenhe warbled, “I
amthe lizard king,I can do anything” – well, possibly true aboutlizards butnot,sadly,abouthimself.
He wasdeadat 27 in1971, a victimof alcoholismandheroin.
Scientistsatthe Universityof Canberrahave beenhavingfunstudyingthe sex livesof ourveryown
beardeddragonlizardsandhave discoveredthathotweathercanchange theirsex.Itseemsthatif
menlizardscan’tstand the heat,theycan change intoladylizards.
Frankly,Ithinkthat isa bitextreme tobe honestandraisesthe question,whydon’ttheyjustcome
inout of the sun?AndwhenI say “ladylizards”,I don’tmeanthe reptilianequivalentsof LesGirls
but actual,real femaleswhocangive birthandeverything.
It got me wonderingif these rebornladylizardsneededtohave the full Brazilianbecause beardson
womenare not all that attractive.
Clare Holleley,the teamleaderforthisresearch,isas excitedasall get-out,boasting, “Thisis the first
time we haveproved thatsex reversal happensin thewild in any reptile at all. “
It’sall to do withtheirchromosomesandMs Holleleyandhercolleagues have publishedtheir
findingsinthe journal “Nature”.Iwon’tbore youwiththe details –infact, I’mnot sure I even
understandthe details –butthose whohave devotedtheirlivestolizardswouldbe fascinatedabout
howthe chromosomesinmale lizardscanget messedupinhotweather.
It seems,forthem,genderreassignmentispartof God’sgrand plan withnoneedat all for delicate
surgeryand yearsof therapy.I can alreadyimagine those chapswholongtobe ladiesrushingto
tropical climestolie inthe sunin an attempttoemulate male lizardswhenall theyriskisskin
cancer.
Ms Holleleyandherteamdrove aroundcentral Australialookingatbeardeddragonswhich,
fortunately,are notshy.
“You driveup nextto them,puta noosearound theirneck,and snag them.Then a quick once-overis
enough to figureouttheir sex.It’susually pretty easy to tell if you look in the rightplaces,” she said.
That laststatementhasto highon the bleedingbloodyobviouslist –get a rope around anybody’s
neckwhentheyare nakedand itwon’tbe hard todiscovertheirgenderIsuppose –not that I’ve
tried,mindyou.
Now,seriouslyfolks,thisisnotgoodnewsatall for beardeddragons.
Whensex-changedfemalesdidthe deedwithnormal males,all of theirbabieswere boys. “They’ve
completely lost a wholechromosomein onegeneration,” Ms Holleleysaid.If thatwasn’tenough,
these boybabieshada highpropensitytoswitchtobeinggirls.
If this keepsgoing,eligiblebachelorscouldbecome ararityinthe beardeddragonworld.Iwas going
to write “hotblooded males” but that wouldbe silly.Lizardsare cold-blooded. Butjustthinkabout
one of these goodoldreallymanlyandmasculine malesgivingapotential bride the once overand
thinkingtohimself, “Thisis uncanny.Shelooksjustlike my old mateTrevor” whenthe reasonshe
lookslike Trevorisbecause once she wasTrevor.
Anotherteammember,ArthurGeorges,hascommentedthatmale-to-female dragonslaymore eggs
which,Ithink, proves thatbeinga motherisdeadeasy.
Justhow these mothersexplainthe birdsandthe beestotheirkiddieswouldbe tricky.Imagine one
asking, “Why did you nameme William mummy?Who wasWilliam?” and mummyhavingtoadmit
shamefacedly,“IwasWilliam. I named you after me.” The whole familycouldendupscreaming
bonkersina psychiatricward.
Laboratory testshave shownthatthe temperature neededtochange sex seemstostartat about
32C and occurs one hundredpercent of the time at about36C accordingto Ms Holleley.
Back in 1978, I couldemphasise withJohnTravolta (Danny) andOliviaNewton-John(Sandy) when
theyrecalledtheirromance the previoussummerinthe ditty, “SummerNights” - Icouldn’thave
agreedmore that “Summerloving had me a blast,summerloving happened so fast...”. Ah,the
innocence of youth.
Nextsummer,Iam stayingquite deliberatelyin-doors.Risktakingisn’twise atmyage.

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The heat is on for lizards

  • 1. The heat is on for lizards! Russell Grenning It nowseemsthatJimMorrison,the leadsingerforThe Doors,was literallytrue whenhe warbled, “I amthe lizard king,I can do anything” – well, possibly true aboutlizards butnot,sadly,abouthimself. He wasdeadat 27 in1971, a victimof alcoholismandheroin. Scientistsatthe Universityof Canberrahave beenhavingfunstudyingthe sex livesof ourveryown beardeddragonlizardsandhave discoveredthathotweathercanchange theirsex.Itseemsthatif menlizardscan’tstand the heat,theycan change intoladylizards. Frankly,Ithinkthat isa bitextreme tobe honestandraisesthe question,whydon’ttheyjustcome inout of the sun?AndwhenI say “ladylizards”,I don’tmeanthe reptilianequivalentsof LesGirls but actual,real femaleswhocangive birthandeverything. It got me wonderingif these rebornladylizardsneededtohave the full Brazilianbecause beardson womenare not all that attractive. Clare Holleley,the teamleaderforthisresearch,isas excitedasall get-out,boasting, “Thisis the first time we haveproved thatsex reversal happensin thewild in any reptile at all. “ It’sall to do withtheirchromosomesandMs Holleleyandhercolleagues have publishedtheir findingsinthe journal “Nature”.Iwon’tbore youwiththe details –infact, I’mnot sure I even understandthe details –butthose whohave devotedtheirlivestolizardswouldbe fascinatedabout howthe chromosomesinmale lizardscanget messedupinhotweather. It seems,forthem,genderreassignmentispartof God’sgrand plan withnoneedat all for delicate surgeryand yearsof therapy.I can alreadyimagine those chapswholongtobe ladiesrushingto tropical climestolie inthe sunin an attempttoemulate male lizardswhenall theyriskisskin cancer. Ms Holleleyandherteamdrove aroundcentral Australialookingatbeardeddragonswhich, fortunately,are notshy. “You driveup nextto them,puta noosearound theirneck,and snag them.Then a quick once-overis enough to figureouttheir sex.It’susually pretty easy to tell if you look in the rightplaces,” she said. That laststatementhasto highon the bleedingbloodyobviouslist –get a rope around anybody’s neckwhentheyare nakedand itwon’tbe hard todiscovertheirgenderIsuppose –not that I’ve tried,mindyou. Now,seriouslyfolks,thisisnotgoodnewsatall for beardeddragons. Whensex-changedfemalesdidthe deedwithnormal males,all of theirbabieswere boys. “They’ve completely lost a wholechromosomein onegeneration,” Ms Holleleysaid.If thatwasn’tenough, these boybabieshada highpropensitytoswitchtobeinggirls.
  • 2. If this keepsgoing,eligiblebachelorscouldbecome ararityinthe beardeddragonworld.Iwas going to write “hotblooded males” but that wouldbe silly.Lizardsare cold-blooded. Butjustthinkabout one of these goodoldreallymanlyandmasculine malesgivingapotential bride the once overand thinkingtohimself, “Thisis uncanny.Shelooksjustlike my old mateTrevor” whenthe reasonshe lookslike Trevorisbecause once she wasTrevor. Anotherteammember,ArthurGeorges,hascommentedthatmale-to-female dragonslaymore eggs which,Ithink, proves thatbeinga motherisdeadeasy. Justhow these mothersexplainthe birdsandthe beestotheirkiddieswouldbe tricky.Imagine one asking, “Why did you nameme William mummy?Who wasWilliam?” and mummyhavingtoadmit shamefacedly,“IwasWilliam. I named you after me.” The whole familycouldendupscreaming bonkersina psychiatricward. Laboratory testshave shownthatthe temperature neededtochange sex seemstostartat about 32C and occurs one hundredpercent of the time at about36C accordingto Ms Holleley. Back in 1978, I couldemphasise withJohnTravolta (Danny) andOliviaNewton-John(Sandy) when theyrecalledtheirromance the previoussummerinthe ditty, “SummerNights” - Icouldn’thave agreedmore that “Summerloving had me a blast,summerloving happened so fast...”. Ah,the innocence of youth. Nextsummer,Iam stayingquite deliberatelyin-doors.Risktakingisn’twise atmyage.