Washington, September 24 : A scientist has claimed the discovery of America's smallest dinosaur, based on the analysis of bones found during the excavation of an ancient bone bed near Red Deer, Alberta, US.
Called Albertonykus borealis, the slender bird-like creature is a new member of the family Alvarezsauridae and is one of only a few such fossils found outside of South America and Asia.
The analysis indicates that the unusual breed of dinosaur, which was the size of a chicken, ran on two legs and scoured the ancient forest floor for termites.
"These are bizarre animals. They have long and slender legs, stumpy arms with huge claws and tweezer-like jaws. They look like an animal created by Dr. Seuss," said Nick Longrich, a paleontology research associate in the Department of Biological Sciences.
"This appears to be the smallest dinosaur yet discovered in North America," he added.
In a paper published in the current issue of the journal Cretaceous Research, Longrich and University of Alberta paleontologist Philip Currie describe the specimen and explain how it likely specialized in consuming termites by using its small but powerful forelimbs to tear into logs.
"Proportionately, the forelimbs are shorter than in a Tyrannosaurus but they are powerfully-built, so they seem to have served a purpose," Longrich said. "They are built for digging but too short to burrow, so we think they may have been used to rip open log in search of insects," he added.
Longrich studied 70 million-year-old bones that were collected on a dig led by Currie at Dry Island Buffalo Jump Provincial Park in 2002 where the remains of more than 20 Albertosaurus sarcophagus individuals were found.
Albertosaurs are a type of tyrannosaur.
The bones were placed in storage at the Royal Tyrrell Museum and Longrich came across them while trying to compare Albertosaurus claws to another dinosaur species.
"This is the oldest and most complete dinosaur of its kind known from North America and it provides evidence that these dinosaurs migrated to Asia through North America," said Longrich.
According to Longrich, "You can really find amazing things if you just keep looking at fossils we already have sitting in museum collections."
"The number of dinosaur discoveries is actually accelerating because we just keep digging up more material to work with," he added.