A lot of times I see that birds are not really chewing the toys they supposed to chew. Can someone recommend what they WOULD CHEW for sure? They are destroying my furniture for now....

Balsa wood. Can't speak highly enough about it. It's cheap, flimsy and can be broken into a million pieces.

thank you, where do you get it?

I get mine at Hobby Lobby. It's a long thin plank in the back of the store. I get about 3 planks each time I run out.

They go through the stuff like crazy.

"craft sticks" aka popsicle sticks are good chewing fun too. They have them at craft supply stores. If you take the time to drill a small hole in them you can string them together, or you can just leave them loose.

My cockatiels love to chew on a toy called Birdie Kabob. They go through one very quickly, though, so I don't get them often, because of the cost.

They also like to chew on vine balls. I get them from MySafeBirdstore.com. I tie several of them onto string and make a hanging toy. If it hangs just below the perch, it makes it extra challenging as they have to pull on the string to bring it up to foot level. If they aren't careful to hold onto it while they are chewing, they lose it and have to bring it up again.

Cardboard in any shape and form. My guys will choose cardboard over anything else as soon as they think they are not supposed to do it lol
At the moment I have a pile of light cardboard boxes and they have much fun chewing and playing peekaboo.

I have a seagrass mat, and for the last week they have been demolishing it.

Coyote seems to love to chew on everything he shouldn't, my keyboard, wires, my kindle, etc. So I started covering everything with magazines and pieces of paper to stop enticing him and he started chewing on those.

You're welcome for this super unhelpful post.

Ok, here's the actually helpful part: He looooooves the little vine thingies, but only if they're the right shape and loose enough so he can undo them and break individual vine pieces so he can shred the thing. I got them from My Safe Bird Store and the heart shape is his favorite for whatever reason. He doesn't like the vine balls they have in stores. He also likes the... what is it called... it's like a woven grass strip that you buy in a rolled up ball. I have to start it off by unraveling it a bit to get him started but then he likes to undo the braid and chew off bits of the grass pieces and chew on them for a few minutes when he gets a good sized piece off. The woven grass thing (it comes in multi colored and natural un-colored) at PetSmart and Petco, so it should be easy to find.

Also, I noticed that the budgies always ignored these toys but once they saw Coyote playing with them, they're all about chewing up these toys now too. So if you can get just one of your flock to start chewing on something appropriate, I bet the rest of them will take interest.

As for your poor furniture that's getting so abused, does that Bitter Apple spray work for birds and is it safe for birds? If so, I'd try spraying that on all the wood they're chewing that they're not supposed to. Or cover it all with towels or tin foil or something that they'd prefer to not chew on so you can break the habit and redirect them to appropriate chew toys.

This is another unhelpful post:

I had covered the top of the nice picture frame with plastic. But, this morning I discovered they are chewing t any way. This is a REALLY nice EXPENSIVE frame I bought for a very special picture.

I love my birds, I love my birds . . . .