Bat (CR 1/1)

Diminutive Animal
Alignment: Always neutral
Initiative: +2 (Dex); Senses: blindsense 20 ft., low-light vision, Listen +8*, and Spot +8*

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AC: 16 (+4 size, +2 Dex), touch 16, flat-footed 14
Hit Dice: 1/4d8 (1 hp)
Fort +2, Ref +4, Will +2

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Speed: 5 ft., fly 40 ft. (good)
Space: 1 ft./0 ft.
Base Attack -; Grapple -
Damage: -
Special Attacks/Actions: -

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Abilities: Str 1, Dex 15, Con 10, Int 2, Wis 14, Cha 4
Special Qualities:
Feats: Alertness
Skills: Hide +14, Listen +8*, Move Silently +6, and Spot +8*
Advancement: -

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Climate/Terrain: Temperate desert
Organization: Colony (10-40) or swarm (10-50)
Treasure/Possessions: none

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Source: Monster Manual

Blindsight (Ex): Bats can "see" by emitting high-frequency sounds, inaudible to most other creatures, that allow them to locate objects and creatures within 120 feet. A silence spell negates this and forces the bat to rely on its weak vision, which has a maximum range of 10 feet.

Skills: Bats receive a +4 racial bonus to Spot and Listen checks. These bonuses are lost if Blindsight is negated.