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Table 1 Speculated hypothesis-specific spatio- (blue) and temporal- (orange) extents of pre-migratory flights

From: Pre-migratory flights in migrant songbirds: the ecological and evolutionary importance of understudied exploratory movements

  1. The size of the circles represent the speculated extent (small, large, or a range) of the flights necessary to fulfil the stated purpose of the movement. For example, simply practicing nocturnal flights would not require large flights of a long duration, while creating maps would require longer time aloft over more area