I've noticed that the cats I've had over the years don't seem to show any interest in the ambient light in a room.
Say a room is quite dark. I turn on the light switch and it's now bright as day. I notice that the cat's eyes might visibly adjust, but she'll be totally calm. Same for the opposite direction.
This has always puzzled me. Wouldn't you think animals would be more sensitive to instant transitions between day and night? Why doesn't it seem to register as an interesting event?
Do other animals care more? (I know one covers a birdcage at night, for example.)