104 research outputs found
Intermittent Gliding in the Hunting Flight of the Kestrel, Falco tinnunculus L.
The hunting flight of the kestrel (Falco tinnunculus) consists of short bouts of flight at wind speed against the wind with the eyes in a fixed position relative to the ground, and of short flights from one such position to the next.
High speed films taken with a camera in a fixed position of a hunting kestrel of known weight and dimensions, allow estimates to be made of the amount of energy required for this behaviour.
A theoretical model shows how a bird could economise by alternating flapping flight with short gliding bouts, without changing the position of the eyes above the ground, by mere displacement of the centre of gravity relative to the head. High speed film data confirm predictions from this model.
A simple field method for stereo-photographic length measurement of free-swimming fish:Merits and constraints
A simple field method for stereo-photographic length measurement of free-swimming fish:Merits and constraints
Hydrodynamics of unsteady fish swimming and the effects of body size:Comparing the flow fields of fish larvae and adults
The social and mating system of the herbivorous reef fish Sparisoma viride:One-male versus multi-male groups
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