The LEGO Ideas Floating Sea Otters (Set 21366) is a 1,234-piece building set for adults that recreates a mother sea otter floating peacefully on her back with her pup resting on her belly. Designed by fan creator Maximilian Lambrecht of Germany and selected through the LEGO Ideas fan vote program, this set captures the charming behavior of wild sea otters with impressive detail and posability.

The mother otter features an articulated build with a poseable head, opening and closing mouth, movable front paws, hinged flippers, and Mixel-joint arms. The baby pup can be placed on the mother's belly, or swapped out for the included buildable clam — reflecting real sea otter behavior. Whiskers are rendered using a new recolor of the bladed claw element. The scene sits on a water-themed display base with a rock formation and seaweed in dark green and olive tones, measuring over 30 cm × 19 cm × 8 cm (approximately 11.5 in. × 7.5 in. × 3 in.).

This set is designed as a display piece and mindful building experience, making it ideal for adult LEGO fans and nature enthusiasts. Recommended for ages 18 and up.