diff --git a/PLAN.md b/PLAN.md
index 6f6c962..bb58581 100644
--- a/PLAN.md
+++ b/PLAN.md
@@ -92,12 +92,12 @@ Check off items as completed. Each phase builds on the previous.
 ## Phase 3: Animal Domain
 
 ### Step 3.1: Animal Registry Schema
-- [ ] Create migration for animal_registry table with indexes
-- [ ] Create migration for live_animals_by_location table
-- [ ] Create migration for animal_aliases table
-- [ ] Create Pydantic models: Animal, enums (Sex, ReproStatus, LifeStage, Status, Origin)
-- [ ] Write tests for table constraints and unique nickname constraint
-- [ ] **Commit checkpoint**
+- [x] Create migration for animal_registry table with indexes
+- [x] Create migration for live_animals_by_location table
+- [x] Create migration for animal_aliases table
+- [x] Create Pydantic models: Animal, enums (Sex, ReproStatus, LifeStage, Status, Origin)
+- [x] Write tests for table constraints and unique nickname constraint
+- [x] **Commit checkpoint** (739b7bf)
 
 ### Step 3.2: Interval Projections Schema
 - [ ] Create migration for animal_location_intervals