Animals
Let’s learn about whales and dolphins
Whales, dolphins and porpoises are all cetaceans — mammals that live in water and have a streamlined body similar to a fish.
MS-LS4-2
Apply scientific ideas to construct an explanation for the anatomical similarities and differences among modern organisms and between modern and fossil organisms to infer evolutionary relationships.
More Stories in MS-LS4-2
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FossilsRhinos, camels and bone-crushing dogs once roamed Nebraska
Scientists digging into the remnants of an ancient watering hole in Nebraska discovered evidence of an Africa-like savanna, complete with rhinos.
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LifeScientists Say: Genus
A genus is a group of closely related species. It’s the first part of the two-part system called binomial nomenclature, used to name living things.
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FossilsScientists Say: Dinosaur
Dinosaurs emerged between 243 and 233 million years ago. While some died out 66 million years ago, others are still with us — birds.
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AnimalsExplainer: Black bear or brown bear?
If you see a bear, check size, shape and more to find out what type it is.
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LifeScientists Say: Hominid
Scientists are still working out what counts as a hominid. Some say it’s just people and our extinct ancestors. Others say add more apes.
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AnimalsGiant worms may have hidden beneath the ancient seafloor to ambush prey
Twenty-million-year-old tunnels unearthed in Taiwan may have been home to creatures similar to today’s monstrous bobbit worms.
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AnimalsScientists Say: Medullary bone
Medullary bone is a layer that forms inside bird and dinosaur bones. It’s a source of the calcium in eggshells.
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ArchaeologyThis prehistoric woman from Peru hunted big game
Women in the Americas speared large prey as early as 9,000 years ago, new archaeological evidence suggests.
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GeneticsScientists Say: Evolution
Evolution is how species change over time. Individuals in the group vary, and some will pass on their genes. Over time, the whole species changes.