| decision-making by a soaring bird: time, energy and risk considerations at different spatio-temporal scales. | natural selection theory suggests that mobile animals trade off time, energy and risk costs with food, safety and other pay-offs obtained by movement. we examined how birds make movement decisions by integrating aspects of flight biomechanics, movement ecology and behaviour in a hierarchical framework investigating flight track variation across several spatio-temporal scales. using extensive global positioning system and accelerometer data from eurasian griffon vultures (gyps fulvus) in israel a ... | 2016 | 27528787 |