Every hexagons tessellates. Hexagons always tessellates when perfectly combined and aligned especially when the x sides and the y sides are parallel to each other. An example of tessellating hexagons is bee hive. Bee hives have perfect tessellating hexagons.
A lot of regular shapes can tessellate (fit together without any gaps) including: triangles, squares and hexagons. However, more than more than one shape can make up a pattern when tessellated. Hope this helped ☺
