Senegal Chameleons may change when they are basking, hunting, ready to mate, or doing other activities. Brown colors may indicate depression or might also just be a sign of brumation. A female may turn brown or white if they are carrying eggs or want to communicate that they are not ready to mate. Sick chameleon may also darken in color so if they are typically a bright green but have suddenly faded to brown or black, you might want to check in with the vet to see if your pet is doing okay.