Along the Gulf Coast, people are killing (and sometime gruesomely mutilating) dolphins in record numbers. At National Geographic, Rena Silverman goes in-depth on the killings, which investigators now believe are the work of multiple people who are not connected to one another. Xeni wrote about it last year, when that was apparently less clear. Is it less or more disturbing that this isn't likely to be an isolated dolphin serial killer? Read the rest “Investigating the Gulf Coast dolphin murders”

Matthew Borgatti built an air-powered, 3D-printed robot tentacle that waves in a friendly fashion and lends a helping hand.

South Korea may soon again allow whale hunting in the waters off its shores for what the government claims are "scientific purposes." The news has sparked criticism from environmental organizations and nations around the Pacific Rim. The country's delegation to the International Whaling Commission said this week that Seoul is reviewing a proposal to hunt minke whales migrating off the Korean Peninsula. Read the rest “South Korea may resume whaling, like Japan, "for scientific purposes"”

In an environmental impact statement covering future plans for U.S. Navy training and testing, an acknowledgement that the use of sonar and explosives "could potentially hurt more dolphins and whales in Hawaii and California waters than previously thought." (AP) Read the rest “Navy: sonar and explosion tests may be harming dolphins, whales”

Dolphin carcasses are displayed by conservationists and environmental police officers at San Jose beach, 40kms north of Chiclayo, Peru, on April 6, 2012. The cause of death of over 800 dolphins in the last four months on the shores of Piura and Lambayeque are still being researched, Gabriel Quijandria, Deputy Environment Minister said on April 20, 2012. More about the ongoing investigation into the possible cause of these mass die-offs: CBS News, MSNBC, AFP, DPA, CNN, (REUTERS/Heinze Plenge) Read the rest “877 dolphins wash up dead in Peru. Why?”

Here in the BoingBoing newsroom, we are dedicated to keeping you informed on the latest developments in cetacean friendship. You already know that dolphins and whales hang out and, in fact, play together

Now, some more awesome news: Dolphins apparently have a system of identifying themselves to each other similar to the way you and I use names.

Scientists have actually known since the 1960s that this system existed. Basically, each dolphin creates their own "signature" whistle when they're very young. In studies of captive dolphins, they used this whistle mainly when they got separated from the rest of the group. It was like a way of saying, "Hey, I'm over here!" Or, given the environment, perhaps some version of "Marco! Polo!"

But at Not Exactly Rocket Science, Ed Yong writes about a new study of wild dolphins that has really increased our understanding of signature whistles and how dolphins use them.

Quick and Janik recorded the calls of swimming dolphin pods using underwater microphones. From 11 such recordings, they worked out that dolphin groups use their signature whistles in greeting rituals, when two groups meet and join. Only 10 per cent of such unions happen without any signature whistles. And the dolphins use their signatures nine times more often during these interactions than during normal social contact. The signature whistles clearly aren’t contact calls, because dolphins hardly ever use them within their own groups. Mothers and calves, for example, didn’t exchange signature whistles when travelling together. And they’re not confrontational claims over territory, because bottlenose dolphins don’t have territories.

Read the rest “Individual dolphins identify themselves to new dolphins they meet”