Scientists have discovered the fossilized remains of a new long-necked, long-tailed dinosaur that has taken the crown for largest terrestrial animal with a body mass that can be accurately determined.

Freshwater species generally are known to suffer higher rates of extinction than terrestrial vertebrates. Extinctions in fishes are mostly caused by loss of habitat and the introduction of ...

But these monsters have an ancient lineage — one that stretches back to the earliest years of animal life on Earth ... they are among the earliest terrestrial arthropod groups found in the ...