Gray whales in the Pacific Ocean, long thought to have fully recovered from whaling, were once three to five times as plentiful as they are now, according to a report to be published September 10 in the Proceedings of the National Academy of Sciences.

Orcas or killer whales may continue to suffer the effects of contamination with polychlorinated biphenyls (PCBs) for the next 30 – 60 years, despite 1970s-era regulations that have reduced overall PCB concentrations in the environment, researchers in Canada report.

Shows at family adventure parks featuring Shamu — an orca or killer whale — have made these gigantic mammals one of the most famous marine animals. Shamu’s wild brothers and sisters, however, face many threats to their survival in the open ocean.

Behind the sailor's lore of fearsome battles between sperm whale and giant squid lies a deep question of evolution: How did these leviathans develop the underwater sonar needed to chase and catch squid in the inky depths?

While sharks instill fear in beachgoers worldwide, they instill a deep sense of curiosity in UT assistant professor and shark expert Dan Huber.

Researchers at the University of Illinois at Chicago have discovered a chemical compound in male blue crabs that is not present in females -- the first time in any species that an entire enzyme system has been found to be activated in only one sex.

An international team of scientists from Canada (Universitй Laval), the U.K. (University of Hull, Cardiff University) and Spain (Doтana Biological Station), have discovered that a pair of closely related species of East African cichlid fishes – a group of fish whose diversity comprising hundreds of species has puzzled evolutionary biologists for decades – evolved divergent immune gene adaptations which might explain why they do not interbreed, despite living side by side.

When the first four-legged animals sprouted fingers and toes, they took an ancient genetic recipe and simply extended the cooking time, say University of Florida scientists writing in Wednesday’s issue of the journal PLoS ONE. Even sharks — which have existed for more than half a billion years— have the recipe for fingers in their genetic cookbook — not to eat them, but to grow them.

New technology has allowed an international team including UK scientists from University of St Andrews and British Antarctic Survey to witness for the first time the behaviour of the southern elephant seal (Mirounga leonina) and how it relates to its physical environment.

Miniature oceanographic sensors attached to southern elephant seals have provided scientists with an unprecedented peek into the secret lives of seals.

Scientists are building a three dimensional computer model to test the ‘bite force’ of the Great White shark using data from a shark caught in beach nets off the NSW Central Coast.

A limpet no bigger than a coin could reveal the possible fate of cold-blooded Antarctic marine animals according to new research published this week in The Journal of Experimental Biology.