Phorusrhacids are extinct natural group of large carnivorous birds which could not fly; also known as terror birds, they were the largest species of apex predators in South America during the Cenozoic era.
They had four toes on its feet, the first toe known as hallux was reduced and did not touch the ground while others were kept in the ground.
The largest terror birds were about 1-3 metres (3-10 ft) in height and weighed more than 6,000 pounds.
What did they feed on
They were carnivores and believed to possibly prey on small horses, rodents and lizards.
Can they fly
Though terror birds were believed to possess small wings that is relative to its body size, they were not ably to fly.
How fast did the run
Terror birds were able to run at a speed of over 60mph and believed that it can possibly match in a race against a cheetah.
Were they aggressive
Phorusrhacids were known to be very aggressive creatures and could not easily be tamed.
How did they go into extinction
Terror birds were successful animals which survived as a group for more than 50 million years. They went into extinction about 2 million years ago during the period that the North and South America merged together at the Isthmus of Panama.
Also, climatic change is believed to have contributed in the extinction of these birds.
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