Another new report:

https://www.newscientist.com/article/2288714-wild-cockatoos-make-utensils-out-of-tree-b...

"Some wild cockatoos whittle tree branches into utensils that they use to open and dig into the seed-laden pits, or stones, of tropical fruit.

***

“'They definitely knew the fruit, and they knew what to do with it,” says O’Hara.

***

"O’Hara’s team filmed one bird pushing a piece of wood against a sea mango. But deep in the rainforest, the researchers found perhaps their hardest evidence of the parrots’ tool use in the wild: a half-eaten sea mango on the jungle floor, complete with a whittled wood fragment still thrust into its pit."

Comment: Cardboard or wood they know how to make and use tools.