A pod of spinner dolphins in the Red Sea.
Complex behaviour such as regional accents and cultural food preferences in whales and dolphins seems to be linked to brain size.
The pygmy right whale,
Caperea marginata, at sea.
Fossils of a whale thought to be found only in southern waters have been discovered at two sites in the northern hemisphere.
Dolphins contribute important knowledge about ocean health.
Marine mammals are often referred to as sentinels of the ocean and research on whales and dolphins in particular contributes important knowledge about the health of our seas.
Navin75/Flickr, Australian Marine Conservation Society, ANU
In this episode of Change Agents, Andrew Dodd speaks with Darren Kindleysides and Don Rothwell on how Australia won a case against Japan's whaling activities at the International Court of Justice.
Ancient whales, such as
Janjucetus illustrated here, used their sharp teeth to capture and process their prey.
Ancient whales were neither gentle, nor giants: they were smaller than those of today and judging from their teeth, a lot meaner.
Humpback whales getting a feed.
Janie Wray/North Coast Cetacean Society
A new study shows that the way humpback whales choose their habitats is affected by humans.
A baleen whale feeding in the Hauraki Gulf, New Zealand.
Dr Krista Hupman
There are plenty of mammals that have adapted to life in water, some more than others. That meant they also had to adapt the way they feed.
More than 400 whales have died on a beach in New Zealand.
A photo from Sea Shepherd allegedly shows a Japanese whaling vessel with a dead minke whale on board.
EPA/GLENN LOCKITCH / SEA SHEPHERD HANDOUT
Japan is once again allegedly killing whales in Antarctica. But after taking Japan to international court in 2014, there's not much Australia can do.
No deep voices here.
Size doesn't always matter when it comes to the pitch of your voice, especially if you're an aquatic mammal.
A blue whale surfaces.
Songs of marine animals can help us discover new populations.
A rare glimpse of a river dolphin in Cambodia.
Dolphin-watching tourism has pros and cons — so what should you think about next time you head out?
Alfred the aetiocetid had teeth but needed a better way to capture his tiny prey.
The largest animals on the planet - the baleen whales - prey on some of the smallest. But how did their teeth evolve into the filters they use today?
Ship strikes can be deadly, as shown by this blue whale off the US northwest.
Craig Hayslip/Oregon State Univ./Flickr/Wikimedia Commons
Ships in Australian waters are getting bigger and more numerous all the time. We need a plan to help them avoid crashing into whales and other large sea creatures.
Sharks: playing their part in reducing climate change.
Poor management of the oceans, including the killing of crucial marine predators, could result in more greenhouse gasses.
Right whales have been shown to be affected by noise pollution.
FWC Fish and Wildlife Research Institute/Flickr
The increasing use of the sea for human activities has resulted in a dramatic rise in noise levels.
Sperm whales, like many other species, use echolocation which can be hampered by noise.
Gabriel Barathieu/Wikimedia Commons
We tend to think of the oceans as quiet, when in fact they're anything but. Noise is the "forgotten pollutant", but the good news is that unlike many other pollutants it can be switched off if we try.
Humpbacks can use their fins as weapons against killer whales.
Humpback whales have been spotted fending off killer whales from attacking other species. But this kind of interspecies altruism raises an evolutionary conundrum.
What are the oldest living animals on the planet?
School of thought.
Understanding this will boost conservation efforts.