Search Results for: Sharks

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756 results
  1. 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
  2. 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
  3. 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
  4. 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
  5. 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
  6. 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

  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. 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
  9. 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
  10. In this underwater photo, Marine biologist Jessica Pate swims beside a large oceanic manta ray.
    Animals

    This marine biologist is on a mission to save endangered rays

    Jessica Pate and the Florida Manta Project confirm that endangered mantas are mating and sicklefin devils are migrating along the East Coast.

    By Brianna Randall
  11. illustration of brown and tan Xiushanosteus mirabilis fish underwater
    Paleontology

    Ancient fish fossils highlight the strangeness of our vertebrate ancestors

    New fossils are revealing the earliest jawed vertebrates — a group that encompasses 99 percent of all living vertebrates on Earth, including humans.

    By Carolyn Gramling
  12. A photo of a northern elephant seal poking its head out of the water.
    Animals

    Northern elephant seals sleep just two hours a day at sea

    The marine mammals have truly awesome stamina for staying awake, sleeping only minutes at a time on months-long trips at sea.

    By Maria Temming