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‘You’d want one as a pet’: the irresistibly cute solar-powered sea slug

The beady-eyed, Pokémon-like leaf sheep is far more ingenious than us land mammals

‘You’d want one as a pet’: the irresistibly cute solar-powered sea slug

TL;DR

  • The leaf sheep (*Costasiella kuroshimae*) is a small sea slug that grazes on specific algae species.
  • It lives in tropical waters around Japan, Indonesia, and the Philippines.
  • The slug practices kleptoplasty, stealing chloroplasts from algae to perform photosynthesis.
  • These chloroplasts are stored in leaf-like branches called cerata on its back, acting as solar panels.
  • The cerata also provide camouflage and chemical defenses, and its rhinophores are sensory tentacles.
  • It was first described in 1993 and has gained popularity due to underwater photography.
  • Its appearance draws comparisons to Pokémon and Shaun the Sheep.