Rock Bird.
Weight[]
This bird is extremely heavy, so he won't fly very far, but his weight can be decreased by tapping the srceen
The actual weight is unknown
Durability[]
This bird can crash through 32 wood blocks, 16 ice blocks, 8 stone blocks and 4 columns. After tapping the screen, each of these gets divided by two up to a maximum of 5 times, where he loses his ability to crash through columns, stone and ice but retains his ability to crash through 1 wood block, making him the lighter Red Bird. Add more blocks, I only know of these.
Special Ability[]
Its special ability can be used a maximum of five times, each time decreasing his size, weight and durability.