Answer: a. G fortis beak depth of 13 mm because this is the longest break that will be able to reach further into the tree bark.
Explanation: has a large beak and can crack the fruit (called the mericarp) in only 2 seconds, exerting an average force of 26 kgf; it can then easily, in about 7 seconds, eat all the four to six seeds of the smashed fruit.