Radiation adaptation refers to the phenomenon of biologically related organisms that have completely different adaptations in form and living habits due to living in different environments.
According to the above definition, which of the following options belongs to radiation adaptation?
Thunderbirds living in the frigid zone, in the snowy winter, their body color is pure white, and in summer,  their body grows tan feathers, which are similar to the mottled color of the summer tundra, thereby protecting themselves.