Requirements:

Train a Beaver Recruit 8 Times
Complete the Water Rescue Collection 6 Times
Complete 40 Animals in the Injured Animal Guide
Rewards:
White Beaver, 3 Animal Vaccine Boosts, Romantic Lake
Comes from:
Level 15
Notes: Beaver Recruits are healed with 10 Beaver Belts. The Injured Animal Guide is inside the WET Tower.