Oldest Known Mammalian Tooth Marks

Science Daily is reporting on the finding of the oldest known tooth marks left by a mammal. They write:

The researchers believe the marks were made by mammals because they were created by opposing pairs of teeth -- a trait seen only in mammals from that time. They think they were most likely made by multituberculates, an extinct order of archaic mammals that resemble rodents and had paired upper and lower incisors. Several of the bones display multiple, overlapping bites made along the curve of the bone, revealing a pattern similar to the way people eat corn on the cob.

So by the late Cretaceous, mammals were considering some dinosaurs food. There is a good deal of suspicion that these were done by scavenging rather than predation—a squirrel-sized rodent would not ordinarily take on a five-foot dinosaur with teeth.

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Eagle From Hell

According to research coming out of Australia, a giant eagle may have been carnivorous after all. The story, in PhysOrg states:

Ken Ashwell of the University of New South Wales in Australia and Paul Scofield of the Canterbury Museum in New Zealand wrote their conclusions in the peer-reviewed Journal of Vertebrate Paleontology.

Using computed axial tomography, or CAT, the researchers scanned several skulls, a pelvis and a beak in an effort to reconstruct the size of the bird's brain, eyes, ears and spinal cord.

They compared their data on the Haast's eagle to characteristics of modern predator birds and scavenger birds to determine that the bird was a fearsome predator that ate the flightless moa birds and even humans.

Paul Scofield? Canterbury? What are the odds? Oh well, back to the story:

Scientists believe the Haast's eagle became extinct about 500 years ago, most likely due to habitat destruction and the extinction of its prey species at the hands of early Polynesian settlers. Before the humans colonized New Zealand about 750 years ago, the largest inhabitants were birds like the Haast's eagle and the moa.

Scofield said the findings are similar to what he found in Maori folk tales. "The science supports Maori mythology of the legendary pouakai or hokioi, a huge bird that could swoop down on people in the mountains and was capable of killing a small child," he said.

Although perhaps sensationalized, the story reminds one that the birds of the air are not the birds of yesteryear. The article doesn't say what the wingspan was but it must have been huge.