Peanut does the same.
Maus notices there is not much sun at her window, so she stores little, and goes from
Kinetic energy. (Please note she is attacking a Crookes radiometer, which, like a cat, also converts solar energy to power. And they both spin nicely when they're set right.)
Looking for alternative sources of fur? Be sure to visit Modulator's Friday Ark #159, and, on Sunday evening, stop by the COTC, to be hosted this week by StrangeRanger.