Each block has notches which you can hide your birds favourite treats amoungst.
The notches provide extra stimulation, as your bird will try to reach inside the notch and also grip their beak between each notch to try and pull and chew off the timber.
The wood blocks are threaded through with twisted tightly wrapped heavy duty kraft paper, which will give your bird extra chewing fun!
Refill Wood Blocks are also available for this toy, please see Toy Parts - Wood
Checkout D.J in the images towards the far right enjoying her Crazy Blocks, Pavarotti in the second image and Charlie in the main image.