LEGO Ideas and CUUSOO 21366 Floating Sea Otters

LEGO Ideas 21366 Floating Sea Otters is a 2026 set depicting floating sea otters, including an adult otter and its baby.

Floating Sea Otters turns a natural animal subject into a LEGO model, focusing on a sea otter and its young. Within LEGO Ideas and CUUSOO, it fits the theme’s pattern of fan-originated concepts selected for release as official sets.

The build uses 1234 pieces to create a brick-built animal display rather than a character-led scene.

This set is aimed at builders who want a display piece, a nature-themed model, or an addition to a LEGO Ideas and CUUSOO collection. Among sets in the same theme, it sits closer to decorative animal modelling than to licensed storytelling or minifigure play.

Inventory of set 21366

The inventory of set 21366 lists 1,234 pieces, spare parts excluded: 287 different lots (one shape in one color) for 170 part shapes. The box also contains 25 spare parts, for small elements that are easy to lose.

Colors of set 21366

Main color: reddish brown, making up 26% of the parts, followed by black (20%) and trans-light blue (13%).

Part types

Most common parts in set 21366

169 of the 170 part shapes in this set have their own page on Setopedia, with their colors, element numbers and the other sets that use them. See all LEGO parts

No part in set 21366 is exclusive: each one is found in at least one other set, which makes replacing a lost element easier.

Rebuilding set 21366 from another set

Share of the parts of set 21366 found in each of these similarly sized sets, counting shape, colour and quantity:

No similarly sized set goes above 25%: the model relies on a little-shared assortment, most of which has to be gathered piece by piece.

Size of set 21366 within its line

With 1,234 pieces, set 21366 ranks #38 out of 94 LEGO Ideas and CUUSOO sets in our database, which have an average of 1,279 parts. Among the 558 sets released in 2026, it ranks #74.