"F" is for "Forkfin"

Forkfin

No. Enc.:  0 (1d3)
Alignment:  Neutral
Movement:  0' (0')
      —Swim:  180' (60')
Armor Class:  3
Hit Dice:  4
Attacks:  1 (gore)
Damage:  3d6
Save:  L2
Morale:  8
Hoard Class:  None
XP:  245

Forkfins are 12' long, saltwater fish known for their speed, agility, and vigor.  Like cetaceans, forkfins navigate and communicate via echolocation; furthermore, they vibrate their sharpened snout-prongs to generate sonic blasts.

Forkfins go berserk when speared or hooked, and gain the Charge ability (used primarily against their captors' watercraft, natch).

Mutations:  Echolocation, Energy Ray (Sonic)