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Description
Coelurus fragilis
Named by Othniel Charles Marsh, 1879
Diet: Carnivore (Prey included insects, lizards, sphenodonts such as Opisthias, mammals, pterosaurs such as Mesadactylus and Comodactylus and small dinosaurs such as Dryosaurus and Nanosaurus, but only when sick or young; it may have also scavenged on carcasses)
Type: Coelurosaurian theropod dinosaur (Tyrannosauroid Coelurid)
Size: 7.9 feet (2.4 meters) long and 44 lb.
Region: North America (Wyoming and perhaps Utah USA)
Age: Late Jurassic (154 to 152.1 million BC; Mid to Late Kimmeridgian)
Enemies: Allosaurus and other larger theropods of the Morrison Formation; crocodylomorphs such as the goniopholids
Episode: Time of the Titans (Only in the book Walking with Dinosaurs: A Natural History)
Info: A small, agile predatory dinosaur and one of the small theropods of the famous Morrison Formation in Western Laurasia in what is now the American west during the Late Jurassic period along with Ornitholestes and Tanycolagreus, Coelurus was long thought to have been another specimen of Ornitholestes until studies by John Ostrom in 1976 and Jacques Gauthier in 1986 show that the hand was a lot different. While its unclear where in the family tree of coelurosaurian theropod dinosaurs it belonged to, studies show that it and Tanycolagreus was a relative of the tyrannosaurs, while others suspect that it was a basal coelurosaur more derived to the tyrannosauroids.

Note: Based on upload.wikimedia.org/wikipedia… , while coloration based on images4.fanpop.com/image/photo… and a jaguar.

So yeah, this is another background creature that's absent in the original, but only appeared in the book Walking with Dinosaurs: A Natural History (but no picture of it is shown) in which a small group of Coelurus stalk among the herd of young Diplodocus by evening, hunting for small prey, but one of the subadult Diplodocus senses the smell of meat and cries the others in alarm, causing the other sauropods to panic, get agitated, and swing their neck and tail. As a result the Coelurus group flees, but one of them gets killed by a huge female Diplodocus. The coloration here is just speculative since they weren't fully described.

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Walking with Dinosaurs is owned by BBC

Description
Coelurus fragilis
Named by Othniel Charles Marsh, 1879
Diet: Carnivore (Prey included insects, lizards, sphenodonts such as Opisthias, mammals, pterosaurs such as Mesadactylus and Comodactylus and small dinosaurs such as Dryosaurus and Nanosaurus, but only when sick or young; it may have also scavenged on carcasses)
Type: Coelurosaurian theropod dinosaur (Tyrannosauroid Coelurid)
Size: 7.9 feet (2.4 meters) long and 44 lb.
Region: North America (Wyoming and perhaps Utah USA)
Age: Late Jurassic (154 to 152.1 million BC; Mid to Late Kimmeridgian)
Enemies: Allosaurus and other larger theropods of the Morrison Formation; crocodylomorphs such as the goniopholids
Episode: Time of the Titans (Only in the book Walking with Dinosaurs: A Natural History)
Info: A small, agile predatory dinosaur and one of the small theropods of the famous Morrison Formation in Western Laurasia in what is now the American west during the Late Jurassic period along with Ornitholestes and Tanycolagreus, Coelurus was long thought to have been another specimen of Ornitholestes until studies by John Ostrom in 1976 and Jacques Gauthier in 1986 show that the hand was a lot different. While its unclear where in the family tree of coelurosaurian theropod dinosaurs it belonged to, studies show that it and Tanycolagreus was a relative of the tyrannosaurs, while others suspect that it was a basal coelurosaur more derived to the tyrannosauroids.

Note: Based on upload.wikimedia.org/wikipedia… , while coloration based on images4.fanpop.com/image/photo… and a jaguar.

So yeah, this is another background creature that's absent in the original, but only appeared in the book Walking with Dinosaurs: A Natural History (but no picture of it is shown) in which a small group of Coelurus stalk among the herd of young Diplodocus by evening, hunting for small prey, but one of the subadult Diplodocus senses the smell of meat and cries the others in alarm, causing the other sauropods to panic, get agitated, and swing their neck and tail. As a result the Coelurus group flees, but one of them gets killed by a huge female Diplodocus. The coloration here is just speculative since they weren't fully described.

Requested by

Walking with Dinosaurs is owned by BBC