The relatively quick evolution of nine unusual shark species has scientists intrigued.
- Living off Australia and New Guinea are at least nine species of walking sharks.
- Using fins as legs, they prowl coral reefs at low tide.
- The sharks are small, don't be frightened.
The axolotl is known to regrow its lower jaw, its retinae, ovaries, kidneys, heart, rudimentary lungs, spinal cord, and large chunks of its brain.
Let's not kid ourselves: Coral reefs are in serious danger. But numerous ambitious projects are underway with the goal of keeping these ecosystems alive.
- Human activity has made it a serious possibility that coral reefs might cease to exist on Earth.
- It's tempting to give into despair over this prospect, but assuming the game is over already doesn't reflect objective reality.
- There is an increasing amount of research and work going into keeping coral reefs alive. Coupled with a reduction in greenhouse gas emissions, the next generation stands a chance of growing up in a world with coral reefs.
Octopuses are known to rapidly change colors during sleep, but it's still unclear whether they dream like humans do.
- The clip is from an upcoming PBS TV show called "Octopus: Making Contact."
- Octopuses have thousands of color-changing cells under their skin called chromatophores that can change colors almost instantly.
- Scientists, however, still aren't sure exactly how octopuses coordinate all of these color-changing cells to form particular patterns.
Humpbacks swap songs at remote group of islands in the South Pacific.
- A whale's song reflects its geographical and social history.
- A new study identifies for the first time a major migratory crossroads where whales meet.
- The discovery sheds light on the mystery of how whale songs evolve across the Pacific.