We have recently added "Macaw Blocks" which are bigger nesting blocks for the toughest of birds. The blocks measure approximately 3.5"x 4"x 1.5".
We recommend the addition of "nesting blocks" to all nest boxes for birds from Senegal size on up. Nest Blocks are soft wood pieces specially cut to approximately ¾" x ¾" x 1 ½" . Place Nesting Blocks into the nest box on top of whatever nesting material you are using, or in larger quantities may be used alone. The smaller the bird, the fewer the blocks, and for larger birds, breeders use more of the blocks as the only nesting material in the box.
The birds pick at the specially cut Nest Blocks and are less tempted to chew on the Nest Boxes themselves prolonging the life of the box.