A more robust signal may be the presence of what’s called a medullary bone – but only sometimes. Like female birds, dino ...

Utahraptor – a feathered, agile, bird-like apex predator. Dromaeosaurs, or more popularly, raptors, are easily some of the ...

Birds come in a wide variety of colors. Some feature relatively dull plumage, while others sport brightly colored feathers.