What does this coloration mean? Nice pictures!!!!

[Melvin]

I sometimes see my chameleon sit like this on a branch, with this strong color and his spikes on his chin are pointing forward.. Does this mean anything like he's territorial or something? Im not stressing him up when i see him like this, It's just like 2 times a month or something, But I love his colors when he's like this

Thanks

 

[Julirs]

He is just fired up! Could be for a number of reasons. He is pretty!

 

[jrh3]

he will do this everytime he see's a female also.