Betta fish grow paler and less active when they are sick or old.
Typically a betta will increase in colour, and in some cases change colours somewhat as they age. If your betta begins to lose it's colour, check for water quality problems or an illness.
He's probably unhealthy.
No, unless the container he/she is in is small
The chameleon is the colour changing egg laying reptile. Colour changing is known as camouflage
For changing the colour of your barn
The chameleon is an animal that is most well known for its colour changing abilities. It uses its colour changing abilities as a form of camouflage to catch food and hide from prey.
The reason is: Chicken
Male Bettas have more colour, are larger fish and have much larger fins than the females.
He might be getting old. If he is paler and less active, than he is sick, old, or unhealthy.
The body colour in the Cambodian is always pale pink regardless of the fin colours. The ordinary Betta has the same colour in both the fins and the body.
If your betta starts to lose colour, it may mean that there is a water quality issue, or the fish is ill. Start by changing the water if it is in a bowl, or changing 50% of water if it is in a tank - make sure the new water is the same temperature as the old water, and add in the correct dosage of water conditioner per the instructions on the bottle.If the betta is ill due to the water quality, it may start to perk up after the cleaning. Make sure that you clean your tank every week, or the bowl every few days.
a chameleon protects its self by changing colour.