DonDiego recommends Death-by-Cassowary.

The cassowary is the nearest animal alive today to the renowned raptor dinosaur.

"The inner or second of the three toes is fitted with a long, straight, murderous nail which can sever an arm or eviscerate an abdomen with ease. There are many records of natives being killed by this bird."__Gilliard, Thomas E. (1958) "Living Birds of the World" Doubleday

The cassowary does not fear humans; in fact, it does not like humans.
DonDiego recommends supplying the three ne'er-do-wells these instructions.
Standard Self-Defense Techniques for Dealing with a CassowarySo you've angered a cassowary:
i. Go closer.
ii. Threaten the bird, either verbally or by making obscene gestures.
iii. Continue to approach.
iv. The bird runs at you suddenly. Let it.
v. The bird's claws inflict a horrible wound in your stomach.
vi. Die.
Ref: Cracked
[So like, . . . who knew "Cracked" was still around?]