Taterbug
BD.org Addict
It’s no not clear -how- they sense UVB, but I believe you or right and there’s some evidence that they do at least regular exposure based on d3 levels. There are also parts of the brain that respond to light.
https://www.researchgate.net/profile/William_Gehrmann/publication/10804226_Do_Panther_Chameleons_Bask_to_Regulate_Endogenous_Vitamin_D_3_Production/links/0912f509af8c0c62d7000000/Do-Panther-Chameleons-Bask-to-Regulate-Endogenous-Vitamin-D-3-Production.pdf
A pretty neat article recently also, about chameleons using bone fluorescence as part of visual signaling.
https://www.nature.com/articles/s41598-017-19070-7
https://www.researchgate.net/profile/William_Gehrmann/publication/10804226_Do_Panther_Chameleons_Bask_to_Regulate_Endogenous_Vitamin_D_3_Production/links/0912f509af8c0c62d7000000/Do-Panther-Chameleons-Bask-to-Regulate-Endogenous-Vitamin-D-3-Production.pdf
A pretty neat article recently also, about chameleons using bone fluorescence as part of visual signaling.
https://www.nature.com/articles/s41598-017-19070-7
