Rhamphorhynchus (CR 1/4)

Tiny Animal
Alignment: Always neutral
Initiative: +9 (+5 Dex, +4 Improved Initiative); Senses: low-light vision, scent, and Listen +5

AC: 17 (+2 size, +5 Dex), touch 17, flat-footed 12
Hit Dice: 1d8-1 (3 hp)
Fort +1, Ref +7, Will +1
Speed: 10 ft., fly 60 ft.(good)
Space: 2 1/2 ft./0 ft.
Base Attack +0; Grapple -12
Attack: Bite +7 melee
Full Attack: Bite +7 melee
Damage: Bite 1d3-4
Special Attacks/Actions: -
Abilities: Str 2, Dex 21, Con 8, Int 2, Wis 12, Cha 10
Special Qualities: Evasion
Feats: Improved Initiative; Weapon Finesse
Skills: Listen +5
Advancement: 2-3 HD (Tiny)
Climate/Terrain: Warm forests
Organization: Solitary, pair, or flight (3-10)
Treasure/Possessions: None

Source: Dragon #318

Evasion (Ex): A rhamphorhynchus that makes a successful Reflex saving throw against an attack that normally deals half damage on a successful save instead takes no damage. A helpless rhamphorhynchus cannot use this ability.

The rhamphorhynchus avoids combat with creatures much larger than itself, but when forced to fight, it nips at its enemies with its bite.