gq: 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.
Question: What species has no long-distance migratory relatives? Question: What are the waxwings Bombycilla moving in response to? Question: Why are the waxwing Bombycilla not migrating for?