After getting to the Fox part in Novac's first quest, he will give you another quest. This time he needs specific animals for a potion.
These animals can spawn in one of many spawn points on both continents (at least one of them is portals rooms).
The listed "known possible spawn locations" are places where the creature has been found, but there probably are more possible places than are listed here.
Locations underlined are places where this creature does NOT occur natively (at least to my knowledge).
Killing works the same way as in Novac #1.
Brown Rabbit
Known possible spawn locations: Seridia Portals Room (can go to any outside map in Seridia), Irilion Portals Room (can go to any outside map in Irilion), White Stone Tirnwood Vale Underground
Racoon
Known possible spawn locations: inside a small cave in southern Zirakinbar next to a waterfall, outside in Zirakinbar, Valley of the Dwarves Gold Mine second level, Arius, Palon Vertas, Emerald Valley Trade Route
Green Snake (20,000 Attack and Defense experience)
Known possible spawn locations: White Stone City Sewers, White Stone Tirnwood Vale Underground, Idaloran Mines, Sedicolis, Willowvine Forest, Idaloran
Red Snake (20,000 Attack and Defense experience)
Known possible spawn locations: Kusamura Jungle, Az??ghal Castle in Zirakinbar, Palon Vertas Coal/Gold mine in southern part of the map, North Redmoon, Aeth Aelfan Wyrmgoth Underground, Egratia Point, Seridia Portals Room (can go to any outside map in Seridia)
Wolf
Known possible spawn locations: Aeth Aelfan, Hurquin, Isles of the Forgotten, Nordcarn South (Ruby) Cave, Iscalrith, White Stone
After you have killed everything, you will receive an additional reward of 60,000 Attack and Defense experience from Novac.