- Plankton: Plankton are microscopic organisms that drift in water. Many species of plankton are pink, such as the copepod *Acartia tonsa* and the diatom *Thalassiosira weissflogii*.
- Rotifers: Rotifers are small, multicellular animals that live in water. Some species of rotifers are pink, such as the rotifer *Brachionus plicatilis*.
- Jellyfish: Jellyfish are gelatinous animals that live in water. Some species of jellyfish are pink, such as the jellyfish *Aurelia aurita*.
- Worms: There are many species of worms that live in water, and some of them are pink. Some examples include the worm *Tubifex tubifex* and the worm *Lumbriculus variegatus*.
- Shrimp: There are also some species of shrimp that are pink, such as the shrimp *Palaemonetes paludosus* and the shrimp *Crangon crangon*.