generallobster is right, robustness is not high up in the design criteria for the Bird and Trout. The emphasis is on incredible cutting performance, and that means a whisper thin blade and edge, just thick enough that it's not flexible. Ergonomics and carryability are also strong suits of the B&T and Deerhunter (the B&T's bigger brother). Keep in mind the B&T is a smaller knife, so if you've got big hands you might want to pass it up altogether for the Deerhunter.
If robustness is what you want, with a general hunting-blade shape, maybe the Fallkniven or CS Master Hunter are worth a look. If incredible cutting ability is what you want, do check out the B&T & Deerhunter.
Joe
jat@cup.hp.com