Testosterone does not make big fighters in chameleons...

kinyonga

Chameleon Queen
"In this study, scientists managed to disprove a hypothesis of the influence of male sex hormones on the ontogeny of sexual dimorphism of Veiled chameleon. Males do not need masculinization by male sex hormones from testicles to grow big and get a large head casque. Male-typical growth can therefore be a baseline from which females depart based on the influence of their sex hormones"...
https://www.natur.cuni.cz/eng/aktua...make-big-fighters-2013-at-least-in-chameleons
 
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