caption_for_videos.txt from The bee <i>Tetragonula</i> builds its comb like a crystal

Stingless bees of the genus <i>Tetragonula</i> construct a brood comb with a spiral or a target pattern architecture in three dimensions. Crystals possess these same patterns on the molecular scale. Here, we show that the same excitable-medium dynamics governs both crystal nucleation and growth and comb construction in <i>Tetragonula</i>, so that a minimal coupled-map lattice model based on crystal growth explains how these bees produce the structures seen in their bee combs.