Looking for a family-friendly holiday break activity? Visit The Marine Mammal Center's hospital and visitor center in Sausalito, California! Tickets are free but must be reserved online in advance. For important health and safety policies and to reserve your tickets, see MarineMammalCenter.org/visit. Please note that we are CLOSED on Thanksgiving, Christmas, and New Year's Day.

Oliver's Otter Phase book cover, depicting cartoon otters interacting with a boy through an aquarium window.

Oliver's Otter Phase

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By Lisa Connors
Illustrated by Karen Jones

Learn about sea otter behavior through the antics of a young boy who falls in love with sea otters during a field trip to the aquarium.


  • Paperback, 32 pages.
  • Recommended for ages 4-8, grades K-3.
  • Includes 4 pages of learning activities.