Springer et al. (2003) contend that sequential declines occurred in North Pacific populations of harbor and fur seals, Steller sea

We report on a wintering area off the Pacific coast of Central America for humpback whales (Megaptera novaeangliae) migrating from

The migratory destinations of humpback whales that winter off the Pacific coast of Mexico were examined using photo-identification. Fluke photographs

We assessed the behavioral context of calls produced by blue whales Balaenoptera musculus off the California coast based on acoustic,

The relationship between blue whale (Balaenoptera musculus) visual and acoustic encounter rates was quantitatively evaluated using hourly counts of detected

The migratory destinations of humpback whales that feed off California, Oregon and Washington were determined using photo-identification. Fluke photographs of

From 1986 to 1996 we examined the reproductive rates, calving rates, and reproductive histories of mature females as part of

Locomotor activity by diving marine mammals is accomplished while breath-holding and often exceeds predicted aerobic capacities. Video sequences of freely

The human contribution to ambient noise in the ocean has increased over the past 50 years, and is dominated by

The acoustic calls of blue whales off California are described with visual observations of behavior and with acoustic tracking. Acoustic