A new study finds that some moths are likely to use their legs, rather than their wings, to initiate flight, The New York Times reports.
Based on individually identifiable animals and a standardized flight initiation protocol, we measured the distance at which a deer detected an approaching threat, and the distance at which it subsequently initiated flight.
Here we report that although Galápagos marine iguanas (Amblyrhynchus cristatus) initiated flight from an evolutionarily recent and unfamiliar potential predator (humans), they failed to show the cardiovascular stress response that facilitates successful escape, even after a prior capture experience.
Because, larger bird species have higher mechanical constraints to initiate flight [27] but have higher body fuel storage capabilities, i.e higher fasting endurance, we expect that vigilance would be more reduced and energy-saving behaviours more enhanced in small than in large body sized species (teals versus tufted ducks versus mallards).
In general, small bees initiate flight at lower thoracic temperatures than larger ones (Stone, 1993a; Stone, 1993b).
In particular, the ability to initiate flight through jumping is critical to predator avoidance and may be influenced by changes in body mass (Mb).
(D ) Percentage of flies that either do not initiate flight (0 s) or fly for time-periods within the binned intervals (20 s each) is shown for the indicated genotypes.
Although forces exceeding body weight may be sufficient to initiate flight, this reduction in jump performance would presumably have significant consequences for the ability of winter ptarmigan to escape predation in comparison to summer birds, particularly as the additional mass is also likely to compromise flight performance.
The pelvic fins are then expanded, lifting the tail out of the water and initiating gliding flight.
