Giant Fly (CR 1/8)

Tiny Vermin
Alignment: Always neutral
Initiative: +2; Senses: darkvision (60-foot range), Listen +2, and Spot +2

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AC: 14 (+2 size, +2 Dex), touch 14, flat-footed 12
Hit Dice: 1/4 d8 (1 hp)
Fort +2, Ref +2, Will +0

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Speed: 15 ft., climb 15 ft., fly 30 ft. (poor)
Space: 2 1/2 ft. by 2 1/2 ft.
Base Attack -; Grapple -
Attack: Bite +4 melee
Damage: Bite 1d3-5
Special Attacks/Actions:

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Abilities: Str 1, Dex 15, Con 10, Int -, Wis 10, Cha 2
Special Qualities: Vermin traits
Feats: Weapon Finesse (bite)
Skills: Climb +14, Hide +14, Listen +2, Move Silently +5, and Spot +2
Advancement:

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Climate/Terrain: Any land and underground
Organization: Solitary or swarm (8-16)
Treasure/Possessions: None

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Source: Web

A giant fly uses its bite attack to nip at foes, then it flies away as quickly as possible before swooping in again for another bite. Wiggling maggots have no form of attack, but they possess vermin traits.

About the size of a hawk, the giant fly is exactly that: a larger version of the flies you commonly see buzzing about carrion, picnics, garbage, and other food sources. Female giant flies, once mated, lay about 200 eggs in decaying organic matter. The eggs transition to larvae within 5-12 hours. (Wiggling maggots are actually those maggots that have gone through the third molting phase of the larval stage.) Those maggots that aren't acting as familiars then pupate for about 3 days before the adult form, the fly, emerges from the puparium. If a maggot is serving as a familiar, the maggot enters the pupa phase very briefly and immediately changes into its adult form. Giant flies eat various forms of decaying organic matter by ingesting then regurgitating it.