No matter where you live, you probably see some bird species that seem to stay put all year long. But did you know these species might still be migrating? Today we're talking partial migration-- where some individuals of a species migrate and some are resident. Why does this happen? Which species do this? How can we even tell?? Check out the article here: "Where do winter crows go? Characterizing partial migration of American Crows with satellite telemetry, stable isotopes and molecular markers" (Townsend et al 2018).