• Movie 1 -

Movie 1. Cryophilic movement of ∼20 well-fed wild-type worms that were cultivated at 15°C and placed on a linear spatial thermal gradient spanning 18−22°C (left to right) on a 9 cm plate (120× speed).

• Movie 2 -

Movie 2. Random dispersal of ∼20 well-fed wild-type worms that were cultivated at 25°C and placed on a linear spatial thermal gradient spanning 18−22°C (left to right) on a 9 cm plate (120× speed).