Fossils
Saber-toothed anchovy relatives were once fearsome hunters
Today’s plankton-eating anchovies sport tiny teeth. But their ancient kin were armed with spiky lower teeth and a giant upper sabertooth.
HS-LS4-4
Construct an explanation based on evidence for how natural selection leads to adaptation of populations.
More Stories in HS-LS4-4
-
GeneticsWhat would it take to make a unicorn?
Onward’s dumpster-diving unicorns seem like an impossibility. But scientists have some ideas about how unicorns could become real.
-
AnimalsAnalyze This: Shimmering colors may help beetles hide
Delve into data showing how brilliant colors that shift as a viewer — or predator — moves may help iridescent insects blend in.
-
AnimalsThe many efforts to lick cat allergies
Up to one in five people around the world may be allergic to cats. Science is coming to help their desire for kitty cuddles.
-
Health & MedicineImmune arms-race in bats may make their viruses deadly to people
An overactive immune system may help bats avoid being sickened by many viruses. This may viruses becoming stronger — and deadlier — when they hit other species.
-
Health & MedicineYour most urgent questions about the new coronavirus
Researchers have more questions than answers right now about 2019-nCoV. They’re racing to understand and stop the coronavirus and the health crisis it poses.
-
FossilsSmall T. rex ‘cousins’ may actually have been growing teens
Dinosaurs once thought to be mini cousins of Tyrannosaurus rex may have been merely adolescent members of the famous species, a new study suggests.
-
EnvironmentAustralian fires have imperiled up to 100 species
As massive wildfires consume huge swaths of Australia’s bush, untold species — many of them found nowhere else — are now threatened with extinction.