Unfortunately, in print run 1 of "Amigurumi Monsters", the instructions for Bibi's "ball on end of the tail" contain a small mistake:
 

Rnd 4: (sc in next 2 st, inc in next st) repeat 6 times [24]
Rnd 5 – 9: sc in all 24 st [24]
Rnd 10: (sc in next 2 st, dec) repeat 6 times [18]

We're sorry for the inconvenience. The mistake has been corrected in the second print run.