Every fall Croton' s jays migrate south  The jays always join flocks of migrating crookbeaks with which they share the same summer and winter territories  If a jay becomes separated from the crookbeaks it is accompanying, it wanders until it comes across another flock of crookbeaks
Clearly, ttherefore, Croton' s jays lack the navigational ability to find their way south on their own
Species other than Croton's jays occasionally accompany flocks of migrating crookbeaks