SRD:Improved Familiar/table2

Familiar	Type/Subtype	Arcane Spellcaster Level
Celestial hawk1	Good	3rd
Fiendish Tiny viper snake2	Evil	3rd
Air elemental, Small	Air	5th
Earth elemental, Small	Earth	5th
Fire elemental, Small	Fire	5th
Shocker lizard	Electricity	5th
Water elemental, Small	Water	5th
Homunculus3	Undead	7th
Ice mephit	Cold	7th
Or other celestial animal from the standard familiar list. Or other fiendish animal from the standard familiar list. The master must first create the homunculus, substituting ichor or another part of the master’s body for blood if necessary.