My husband and I were both like, ‘Oh, my God, what is a roadrunner doing here?’” Young, a biologist and nature writer, says. ...

Modern birds have markedly foreshortened tails and their body mass is centred anteriorly, near the wings1,2,3,4,5. To provide stability during powered flight, the avian centre of mass is far from ...

Because Ostrom showed in 1974 that Archaeopteryx had no arboreal features, and that birds probably evolved from bipedal, terrestrial theropods 3, 4, the arboreal theory was effectively dead ...

In zoology, the term “bipedal” refers to animals that use only two legs for walking. There are several groups of modern ...

Birds are descended from theropod dinosaurs, a group of bipedal animals that ranged in size. Some were as small as modern sparrows, while others were huge, such as Tyrannosaurus rex .

The bird may have weighed 140-300 grams (4.9-10.6 ounces), or about the same as a pigeon. ... from bipedal theropod dinosaurs such as Tyrannosaurus to birds. Advertisement “ ...

The gradual evolutionary change – from fast-running, ground-dwelling, bipedal theropods to small, winged, flying birds – probably started about 160 million years ago. It was possibly due to a move by ...

The acquisition of bipedalism is considered to be a decisive step in human evolution. Nevertheless, there is no consensus on its modalities and age, notably due to the lack of fossil remains.