11. There are three subspecies, of which only the Fennoscandian form is African fiddler crab . 12. Fiddler crabs are small, and males have one large and one small front claw.13. Jocelyn accompanied him on this expedition for the purpose of documenting Asia's fiddler crabs . 14. Q : I have a pair of fiddler crabs . 15. Giant Fiddler crabs kill and consume a few people as the weather grows ominous again. 16. The differences in claw sizes, however, are not as marked as in male fiddler crabs . 17. There are also colonies of fiddler crabs and mud-skippers. 18. Palmer studies fiddler crabs , a species whose mating system clearly is affected by the moon's phases. 19. But the 17-year-old ably translates : " It's about the biological clocks of fiddler crabs ." 20. The Wonder Pets journey to a small village in old Russia to save a fiddler crab .