Search Results for: Sharks

Open the calendar Use the arrow keys to select a date
761 results
  1. An illustration of a megalodon about to eat a brown seal while a great white shark swims in the top left of the frame.
    Paleontology

    Megalodon sharks may have become megapredators by running hot

    O. megalodon sharks were warm-blooded megapredators. But colder-blooded great white sharks may have had an evolutionary edge when food sources dwindled.

    By Carolyn Gramling
  2. A shiver of scalloped hammerhead sharks swim near the surface, in this underwater photograph. These endotherms may thermoregulate by closing their gills as they go deeper.
    Animals

    Why some hammerhead sharks seem to ‘hold their breath’ during dives

    Scalloped hammerhead sharks in Hawaii seem to limit the use of their gills during deep dives to prevent losing heat to their surroundings.

    By Freda Kreier
  3. An underwater photo of two researchers diving beside a female whale shark.
    Oceans

    ‘Jet packs’ and ultrasounds could reveal secrets of pregnant whale sharks

    Only one pregnant whale shark has ever been studied. New underwater techniques using ultrasound and blood tests could change that.

    By Brianna Randall
  4. Several blue, cylindrical SharkGuard devices hanging by string off a rail
    Animals

    These devices use an electric field to scare sharks from fishing hooks

    SharkGuard gadgets work by harnessing sharks’ ability to detect electric fields. That could save the animals’ lives, a study suggests.

    By Darren Incorvaia
  5. Fishers pull in a large Atlantic bluefin tuna from choppy seas
    Oceans

    Sharks face rising odds of extinction even as other big fish populations recover

    Over the last 70 years, large ocean fishes like tuna and marlin have been recovering from overfishing. But sharks continue to decline toward extinction.

    By Jake Buehler
  6. An underwater photo of a tiger shark with an orange camera on its side
    Ecosystems

    Tiger sharks helped discover the world’s largest seagrass prairie

    Instrument-equipped sharks went where divers couldn’t to survey the Bahama Banks seagrass ecosystem.

    By Nikk Ogasa

  7. The animal kingdom never ceases to amaze

    Editor in chief Nancy Shute revels in the wonder of animals, from psychedelic toads to extinct pterosaurs.

    By Nancy Shute
  8. Tropical fish biologist Mark Meekan, in a dive suit, swims near the nose of a whale shark.
    Animals

    Whale sharks may be the world’s largest omnivores

    An analysis of the sharks’ skin shows that the animals eat and digest algae.

    By Freda Kreier
  9. a composite of photos of a lion, a resplendent quetzal, golden poison frog and blue shark (left to right)
    Science & Society

    Humans exploit about one-third of wild vertebrate species

    An analysis of nearly 47,000 vertebrate animal species reveals that using them for food, medicine or the pet trade is helping push some toward extinction.

    By Sid Perkins
  10. Pictures of a fossilized theropod, Ubirajara jubatus
    Paleontology

    Paleontology has a ‘parachute science’ problem. Here’s how it plays out in 3 nations

    When researchers study fossils from lower-income countries, they often engage in dubious or illegal practices that can stifle science.

    By Helen Thompson
  11. illustration of megalodon about to eat a pod of toothed whales
    Paleontology

    Great white sharks may have helped drive megalodons to extinction

    Analyzing zinc levels in shark teeth hints that megalodons and great whites competed with each other for food.

    By Carolyn Gramling
  12. two museum works place a 8-meter-long model of a megalodon shark in a museum display
    Paleontology

    Megatooth sharks may have been higher on the food chain than any ocean animal ever

    Some megalodons and their ancestors were the ultimate apex predators, outeating all known marine animals, researchers report.

    By Asa Stahl