n large animal 

Perception +10; low-light vision, scent (imprecise) 30 feet

Skills Acrobatics +10, Athletics +9 (+15 to Jump)

Str +2 Dex +3 Con +3 Int -5 Wis +1 Cha -4

AC  19; Fort +12, Ref +12, Will +4

HP 50

Speed 30 feet

Melee [>] proboscis +10, Damage 1d8+4 piercing plus Suck Blood and flea fever

Suck Blood [>] Requirements The giant flea's last action was a successful proboscis Strike; Effect The giant flea drinks the creature's blood. The victim becomes drained 1 and the flea regains 5 HP.

Flea Fever (disease) Drain from flea fever can't be reduced or recovered from naturally until the disease is cured. Saving Throw DC 18 Fortitude; Stage 1 drained 1 (1d4 hours), Stage 2 drained 1 and sickened 1 (1 day), Stage 3 drained 2 and sickened 1 (1 day), Stage 4.

Extinction Curse #1: The Show Must Go On, page 83.