Yes, he's done another 'rodent' PC species. What is it with Catodon? Must be fixated or something. Best humour him and give him some feedback, poor thing.
You’re a bat, a small flying insect eating vermin perfectly adapted to the night. Your fur is brown, grey, or black. You have little or no tail and your membranous wings can be dark or pale. Your mean tiny black eyes stare out from a grotesque face frames by oversized fleshy ears. Your habits of sleeping and urinating while upside down coupled with your disgusting dietary habits make you unwelcome among common folk.
Scholars may argue the point but for most people bats are flying mice and therefore rodents. Unlike their larger cousins the flying foxes most bats eat insects. Sometimes a bats gains the spark of true intelligence from eating the insects around a witches hut or alchemists workshop. However it is far more common for wizards or priests to deliberately imbue bats with intelligence to act as spies. Bats are uniquely suited to the dark caverns of the deep earth where they are exposed to the natural arcane energies of found there. There are rumors of whole colonies of intelligent bats hidden in the deepest places of the world. These Cavern Bats are said to have their own culture using arcane lore and the gifts of dark gods to hold their caves against invasion by other denizens of the deep earth.
Common personality traits: sinister, flighty, suspicious, secretive, clannish.
Common physical traits: grey fur, tiny eyes, tiny pointed teeth, oversized ears.
Example Names: Squee!, Little Spy, Servant of the Night Lord, Kee!, Zees!
Splinter Race Feats: Bats serving sorcerers or priests are often touched with Devilish Heritage (diabolical devil bat) or There are colonies in the deep earth of sinister ‘cavern bats’, many with the Abide in Darkness feat. Unless you choose one of these you are a ‘night bat’. Many are plague bearers (see feat in this database).
Type: Tiny quadruped Beast with a reach of 1. Four Tiny characters can fight within a square. Your maximum wounds equal your Constitution score x½ (rounded up) [-1.5].
• All the core rodent abilities [5.5] see below
• Attributes: +6 to Wisdom, –4 Strength, –4 Charisma [3.5]
• Base Speed: 10 ft. [-1.5]
• Winged Flight 40 
• Darkvision II [1.5] as this represents sonar it is not affected by flash but is affected by bang damage.
• Repulsive Habits: You suffer a –2 penalty to Appearance (see FC, page 153) [-0.5]
• Achilles Heels: Double damage and no resistances against bang, blunt, flash, and fire attacks [-0.5x4=2]
Author’s note: Winged flight 30 was priced by plotting known values for winged flight 0, 40, and 50 and deriving the equation, price=0.05xSpeed.
for those who don't know:
All my rodents have the following in common.
• Beast Type [-2]
• Sharp Hearing 
• Sniff ‘em out 
• Unarmed Proficiency 
• Light Sensitive: Any time you enter a more brightly lit area, you suffer 20 pts of flash damage. [-1]
• Swarm NPC quality [0.5]
• Lean Season 
• Cat Fall 
• Bite I 
• Reviled [-1]