New research shows just how different male and female sharks can be.
Copepod with eggs (blue). Copepods are typically just a few millimeters long, but are important food sources for small fish.
DNA sequencing is making it possible for scientists to identify thousands of species of zooplankton – drifting animals that are key links in ocean food webs.
Normana Karia / shutterstock
We cannot spot every shark in the ocean. But we can detect their 'environmental DNA'.
A pelagic snail ensnares food with with a mucous web.
Linda Ianniello https://lindaiphotography.com
Biologists are finding new evidence that these ocean invertebrate grazers don't just ingest whatever they catch. They can actually be picky eaters – and their choices might influence ocean food webs.
A Kemp’s ridley hatchling makes its way to the water on Padre Island, Texas.
During sea turtle nesting season, scientists collect data and assess how turtles are doing. But they know less about how plastic pollution, fishing and warming oceans are affecting turtle numbers.
The first March for Science, April 22, 2017, Washington DC.
On the eve of the March for Science, a marine biologist explains why she's returning from abroad to speak out for science in the Trump era.
Yellow-bellied sea snake (
Coleman M. Sheehy III, Florida Museum of Natural History
Sea snakes spend their lives in the water, giving birth to live young at sea, so why are they only found in some of the world's oceans? The answer lies in a combination of climate and geography.
Extreme weather led to starfish mass strandings along beaches in Kent and East Yorkshire.
The CSIRO has provided new estimates of population sizes for White Sharks in Australian waters.
How many shark encounters have there been at your local beach? Explore our interactive map to see 20 years of incidents between humans and sharks in coastal waters around Australia.
Nightvision, ejectable stomachs and regrowable arms mean starfish are more than meets the eye.
Image from video of Mariana snailfish.
SOI/HADES/University of Aberdeen (Dr. Alan Jamieson)
The Mariana snailfish lives nearly 27,000 feet underwater, but has features that help it adapt to intense water pressure and cold. Physiological limits may prevent fish from surviving in deeper water.
An animal behaviour expert gives his view on finding that a killer whale can copy the sound 'hello'.
Author Tom Iliffe leads scientists on a cave dive.
Scientific fieldwork that happens underground and underwater in spectacular but dangerous caves opens a window on a largely unknown world.
Jellyfish have a lot more going for them than blobby bodies and a sting.
The sea remains the least explored habitat on our blue planet.
Luis Lamar / BBC NHU
Few fish can survive in these freezing waters, so invertebrates are the dominant predators.
Over 20 cephalopods crawled on to New Quay beach. What was going on?
Make yourself at home.
Scientists have just discovered an unusual symbiotic relationship between crabs and living corals.
Colleen Burge counts oysters on an oyster aquaculture lease in California.
Oysters grow in seawater and filter their food from it, so how do you shield them from waterborne diseases? Scientists are working to develop strains that are resistant to a fast-spreading herpes virus.
Hey, what about us? Whale shark (spotted) and manta ray, a close shark relative.
As the Discovery Channel and National Geographic Wild unleash a week of dueling shark programs, a biologist advises viewers to take what they see with a large grain of sea salt.