[1
]
Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St
Andrews, Fife KY16 8LB, UK. Electronic address: kjr33@st-andrews.ac.uk.
[2
]
Scottish Oceans Institute, University of St Andrews, Scotland KY16 8LB, UK.
[3
]
Sea Mammal Research Unit, Scottish Oceans Institute, University of St Andrews, St
Andrews, Fife KY16 8LB, UK.