generate questions: Species that have no long-distance migratory relatives, such as the waxwings Bombycilla, are effectively moving in response to winter weather and the loss of their usual winter food, rather than enhanced breeding opportunities.
What species has no long-distance migratory relatives? {sep_token} What are the waxwings Bombycilla moving in response to? {sep_token} Why are the waxwing Bombycilla not migrating for? {sep_token}