The Zoologist is a town vendor added in Terraria’s Journey’s End (1.4) update, and she sells animal-themed vanity, mounts, pets, critter accessories, and eventually the Universal Pylon. Getting her to move in comes down to two things happening at the same time, and both are within reach early in a playthrough.
Quick answer: Fill the Bestiary to at least 10% (55 entries) and keep one valid, empty house available. Once both are true, the Zoologist can move in on any following day.
Zoologist spawn requirements
She is a pre-Hardmode NPC, so you do not need to defeat any boss to unlock her. Meet the two conditions below and she will arrive.
| Requirement | Detail |
|---|---|
| Bestiary progress | At least 10% filled, which equals 55 entries |
| Housing | One valid, vacant house available for her to occupy |
After both boxes are ticked, she does not appear instantly. She can move in on any day from that point onward, so give it a day cycle or two if she is not there right away.
Fill the Bestiary to 10%
The Bestiary is a catalog that records every creature, enemy, NPC, and boss you meet. You add an entry by killing a creature with any weapon at your disposal. Repeated encounters expand each entry with stats, drop rates, and spawn details.
Reaching 55 entries happens naturally through normal exploration and combat. Clear surface critters and common enemies across a few biomes and you will cross the 10% line quickly. A progress bar at the bottom of the Bestiary screen shows exactly how close you are.
Build a valid house for her
Her housing needs match those of most vendors. Use the Housing menu’s query tool (“?”) on a room to confirm it counts as valid before expecting her to settle.
- Structural walls and a ceiling made from blocks that evil biomes cannot corrupt, such as Stone or Wood
- Player-placed background walls so enemies cannot spawn inside
- An entrance, usually a door or platform
- A flat-surface item such as a Table, Work Bench, or Dresser
- One comfort item such as a Chair, Sofa, or Bed
- Any light source, even a single Torch
- A room of at least 60 tiles in total area
If the query tool reports “This is not valid housing,” fix the missing element and try again. Once she occupies a room, the query tool shows her portrait inside it, which confirms she has moved in.
What the Zoologist sells
Her stock is not fixed. Some items are always in the shop, while others unlock at higher Bestiary percentages, after certain bosses fall, during specific moon phases, or during events. The full lineup is below.
| Item | Cost | Availability |
|---|---|---|
| Guide to Critter Companionship | 5 Gold | Always available |
| Cat License | 5 Gold | Always available |
| Leather Whip | 10 Gold | Bestiary at 3% (17 entries) |
| Squirrel Hook | 2 Gold | Bestiary at 10% (55 entries) |
| Koi Kite | 2 Gold | Bestiary at 10% (55 entries) |
| Dog License | 5 Gold | Bestiary at 25% (137 entries) |
| Mollusk Whistle | 20 Gold | Bestiary at 25% (137 entries) |
| Digging Molecart | 50 Gold | Bestiary at 25% (137 entries) |
| Critter Shampoo | 10 Gold | Bestiary at 30% (164 entries) |
| Sakura Sapling | 1 Gold | Bestiary at 30% (164 entries) |
| Yellow Willow Sapling | 1 Gold | Bestiary at 30% (164 entries) |
| Dusty Rawhide Saddle | 25 Gold | Bestiary at 30% (164 entries) |
| Royal Gilded Saddle | 25 Gold | Bestiary at 30% (164 entries) |
| Black Studded Saddle | 25 Gold | Bestiary at 30% (164 entries) |
| Jousting Lance | 6 Gold | Hardmode, Bestiary at 30% (164 entries) |
| Rabbit Perch | 15 Gold | Bestiary at 40% (219 entries) |
| Bunny License | 5 Gold | Bestiary at 45% (246 entries) |
| Kaguya | 1 Gold | Bestiary at 45% (246 entries) |
| World Globe | 3 Gold | Bestiary at 50% (273 entries) |
| Moon Globe | 3 Gold | Bestiary at 50% (273 entries) |
| Tree Globe | 3 Gold | Bestiary at 50% (273 entries) |
| Lightning Carrot | 50 Gold | Bestiary at 50% (273 entries) |
| Ball O’ Fuse Wire | 50 Gold | Bestiary at 70% (383 entries) |
| Universal Pylon | 1 Platinum | Bestiary filled completely (546 entries) |
| Mud Bud | 50 Gold | After defeating Plantera |
| Crawltipede Kite | 2 Gold | After defeating the Solar Pillar |
| The Werewolf | 1 Gold | Night of a full moon |
| Full Moon Squeaky Toy | 30 Gold | Hardmode, during a Blood Moon |
| Fairy Glowstick | 75 Copper | All three fairy entries unlocked in the Bestiary |
| Swarm Grenade | 10 Gold | During a Party |
| Any Pylon | 10 Gold | In a matching biome and near another NPC |
She also stocks rotating vanity ears and tails tied to moon phases. Each set is 3 Gold and appears only during its window.
| Vanity set | Moon phase |
|---|---|
| Dog Ears, Dog Tail | Full moon or waning gibbous |
| Fox Ears, Fox Tail | Third quarter or waning crescent |
| Lizard Ears, Lizard Tail | New moon or waxing crescent |
| Bunny Ears, Bunny Tail | First quarter or waxing gibbous |
Where to place her for cheaper prices and a pylon
Her happiness controls her prices and whether she will sell you a biome pylon. Higher happiness lowers costs and unlocks the Forest Pylon when she lives in the Forest with enough favor.
| Preference | Biome | Neighbor |
|---|---|---|
| Loves | — | Witch Doctor |
| Likes | Forest | Princess, Golfer |
| Dislikes | Desert | Angler |
| Hates | — | Arms Dealer |
Set her up in a Forest home with the Witch Doctor or Golfer nearby, and keep the Angler and Arms Dealer away, to get her lowest prices and access to the Forest Pylon.
Good to know
The Zoologist transforms into a werefox during a full moon or Blood Moon. This changes her sprite and quotes but nothing about gameplay, and she reverts at dawn (4:30 AM). If she is threatened, she defends herself with claw strikes, dealing 15 damage early on and gaining stat boosts as you progress.
Note: In the secret Vampirism world seed, the Zoologist replaces the Guide as the starting NPC. Outside that seed, the Bestiary is already at 10% or more when she is present, so the Squirrel Hook, Leather Whip, and Koi Kite are available immediately. In Vampirism worlds, those three are not stocked from the start.
With a valid empty house standing and 55 Bestiary entries logged, she is one of the easiest vendors to secure early, and steadily filling the Bestiary afterward keeps expanding her shop all the way to the Universal Pylon.
