The Dictionary says: "Liquids take the shape of the container while maintaining a constant volume".
We think it is quite clear from these photos: Cats are liquid!
in a cell phone bill
In a tea kettle
In a pretty vase
In a tight space
In a kleenex box
In a baking dish
In a tree stump
In a drinking fountain
In the box of that new gadget you just bought
In a basket
In a shoe box
In another basket
In a box of their medicine
In a tree pot
Between two couch cushions
In a glass
In a tupperware
In a sink
On top of a chair
In a smaller glass
In a car cup holder
On top of some pants
In a tiny basket
In a frying pan
In your favorite baseball cap