Leptorhynchos

Say it: lep-toh-RING-koss

Name means: “slender beak”1

Ate: A bit of everythingOdd feathered dinosLate Cretaceous

Leptorhynchos was a small, bird-like dinosaur that lived in what is now Texas, USA. It had a slender, slightly upturned beak and probably ate a mix of plants and small animals.1 3

Lived

84 to 66 million years ago3

Late Cretaceous

Fossils found in

Texas, USA, and possibly Alberta and Saskatchewan, Canada1 3

Food

A bit of everything3 1

Length

1.75 m1

estimate

Weight

19 kg1

When did it live?

Triassic

Jurassic

Cretaceous

252 million years ago20114566, the asteroid

How big was it?

How long was it?

How heavy was it?

as heavy as 5 house cats

as long as 4 house cats nose to tailas long as 10 bananas end to endas heavy as 160 bananas

How big was Leptorhynchos compared to YOU?

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cool stuff

Fun facts

Leptorhynchos lived about 80 to 72 million years ago, during the Campanian stage of the Late Cretaceous.1

Its name means 'slender beak' in Greek, because its beak was narrow and pointed.1

Leptorhynchos was a caenagnathid, a group of theropod dinosaurs that are closely related to oviraptorosaurs.1 2

Only one species is widely accepted: Leptorhynchos gaddisi, named after the Gaddis family who owned the land where the first fossil was found.1

Leptorhynchos was small for a dinosaur, only about 1.75 metres (5.7 feet) long and weighing around 19 kilograms (42 pounds).1

Its fossils were found in the Aguja Formation in Texas, which was once a coastal marsh and floodplain.1

Leptorhynchos shared its home with many other dinosaurs, including horned dinosaurs like Agujaceratops and duck-billed dinosaurs.1

AI-made picture of Leptorhynchos — An AI-made picture of how Leptorhynchos might have looked, made by a computer from what scientists know. It is a guess: the real animal may have looked different, and nobody knows its true colours.

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For dino experts

Scientific name: Leptorhynchos
Named by: Longrich et al. 20133
Group: Odd feathered dinos
Family / clade: Caenagnathidae3
Classification: Theropoda > Oviraptorosauria3
Age of the rocks: 84 to 66 million years (Campanian / Maastrichtian)3
Rock formations: Dinosaur Park, Aguja, Frenchman3
Countries: Canada, USA3
Fossil records: 10 in the Paleobiology Database3
Discovery: Leptorhynchos was named in 2013 by Nick Longrich, Ken Barnes, Scott Clark, and Larry Millar based on fossils from the Aguja Formation in Texas.1 3
Still debated: Scientists are not sure whether some fossils from Canada and other US states really belong to Leptorhynchos or to other caenagnathids.1

Where the facts come from

Leptorhynchos gaddisi (en.wikipedia.org)
Caenagnathidae from the Upper Campanian Aguja Formation of West Texas, and a Revision of the Caenagnathinae (bioone.org)
Leptorhynchos in The Paleobiology Database (CC BY 4.0): age, places, rock formations, classification.

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