Terror Birds were flightless carnivorous birds from the Paleogene and Neogene periods of Earth's history.
In Walking with Beasts
Phorusrhacos appeared in the episode `Sabre Tooth.` It was first seen as a pair chasing a Smilodon cub. One of the birds tipped it over with its beak. Just when they were about to complete the kill, Half-Tooth (an adult male Smilodon) scared the birds away.
A flock of Phorusrhacos waited around a Macrauchenia a pack of Smilodon just killed. One daring individual tore a bit of flesh off the carcass when the cats were still feeding. When the pack went, the birds started eating the carcass.
One Phorusrhacos later killed a juvenile Macrauchenia. Half-Tooth then stole the carcass of it.
When Half-Tooth seriously injured on of the Smilodon brothers, a pair of Phorusrhacos were seen eating the carcass.
In Prehistoric Park
Saving the Sabertooth
In the episode `Saving the Sabertooth,` a Phorusrhacos was seen hanging around a dead Toxodon a Smilodon killed. After the pack left, the bird began to eat. Then, one of the cats came back and scared it away. Nigel Marven got a chunk of meat and tied it to his car. The Phorusrhacos follow Nigel through the time portal and into the park. Bob created a pen for it. In the end, the Phorusrhacos settled into the park.
Between the events of `Saving the Sabertooth` and `Supercroc,` the Phorusrhacos had been escaping its pen due to having dirt baths. Bob and his team had to fill in the holes with stones. In `Supercroc,` the Terror Bird once again escaped so Bob had to lead it to its pen with a slice of meat. When the Titanosaurs wrecked havoc in the park, they broke down the Phorusrhacos' pen. It was later fixed and the bird was returned to it.
- Full article: Terror Bird (Primeval)