... ) 10 3 2003 © The Company of Biologists Limited 2003 2003 alcid Barents Sea common guillemot Uria aalge foraging behaviour. Understanding the role and operation of top predators, such as seabirds, in marine systems requires investigation of their diet and feeding ecology...

... and increasing the lift-to-drag ratio. A movie is available on-line. *e-mail: christoffer.johansson@zool.gu.se 26 11 2001 © The Company of Biologists Limited 2002 2002 puffin Fratercula arctica Alcidae alcid swimming diving locomotion kinematics. Underwater wing...

... their wings out of the water ( Croll and McLaren, 1993 ). Thermal conductance is very low in U. lomvia and, in common with all alcids, they are extremely well adapted to life in cold waters ( Gabrielsen et al . 1988 ). The optimal timing of the obligatory and facultative components of the HIF is one...