Suggestions for "upgrade" from almonds

[Owlet]

Hi, so I've been trying to get Lincoln into chewing harder things and I've had very very little luck with plain woods as he has no "reward" of from chewing them. He's been getting shelled almonds for a few months now (only 1-2 a day) and he's getting really good at opening them, even ones that he would previously not even bother trying to open. But I'm not sure where to go from here. I'm not familiar with any other shelled nut that is harder than an almond but wouldn't be THAT hard like a walnut. I've tried tying together pieces of wood to "cup" a treat but he just chews off the string (its jute so safe.) I am not really good at working with wire either. Any suggestions?

 

[Macawdamia Nut]

I know my way around nuts with a macaw, but I admit I am a bit stumped. In order of difficulty in cracking the shell, I would rank it this way:

Pistachios
Almonds
Walnuts (US type)
Hazelnuts
Pecans
Walnuts (French type)
Macadamias
Brazil nuts (I can barely even crack them with a heavy duty nutcracker!)

Maybe you can partially crack a walnut for your bird? He can finish the job.

 

[kme3388]

I know my way around nuts with a macaw, but I admit I am a bit stumped. In order of difficulty in cracking the shell, I would rank it this way:

Pistachios
Almonds
Walnuts (US type)
Hazelnuts
Pecans
Walnuts (French type)
Macadamias
Brazil nuts (I can barely even crack them with a heavy duty nutcracker!)

Maybe you can partially crack a walnut for your bird? He can finish the job.

I have an Ekkie with a soft beak. He can’t get though almonds even. My macaw can break through Brazil nuts in seconds. I have complete opposite issues with my parrots. I need to find something more challenging for my macaw, and a happy starting place with my Ekkie.

I hope someone has some feedback that can help as I run into the same issue as the above poster