E18 Funny cat tries to rescue her kittens from a box

The cute kittens are playing in an empty box, but suddenly their mom cat sees that the kittens are in the box, she gets scared and start trying to rescue the kittens from the empty box.
The mom cat start then playing with her kitten, one of the kittens try to drink milk from the mom cat.
These kittens like to play in this empty box, I found that this empty box is one of the best cat toys, the kittens like this toy more than any other cat toys, I bought the kittens a lot of cute cat toys from the pet store, also sometimes the pet store give me present toys when I buy the dry cat food for the kittens, but among all of the presents and the toys for the cats, the kittens like the empty box the most.
The kittens spend a lot of time playing with this empty box, they hide inside it, and climb on the top of it, this empty box is like a playing park for the kittens.
If you have kittens and you need toys for the kittens, you do not need to buy expensive cat toys from the pet store, you can just go to any store near you and ask for any empty box, then give the empty box to the cat or kitten that you have, and let the cat or kitten play with it, they will enjoy it more than any other cat toys.