Approximately 100 million years ago, dinosaurs might have congregated to engage in a mating dance in a tidal area near Denver, Colorado. Recent research published in Cretaceous Research indicates that numerous intriguing scrape marks found in the stones of Colorado’s renowned dinosaur ridges are identified as Leks, potentially the largest known dinosaur mating display sites.
“Leks, or ‘Keeping Arena,’ refers to a location where numerous individuals come together to showcase courtship behaviors to attract mates,” stated Dr. Caldwell Bunting, the lead author of the study, in a conversation with BBC Science Focus.
Many contemporary birds, including knots and feathers—descendants of dinosaurs—exhibit similar behaviors, noted Bunting.
The hypothesis that dinosaurs engaged in such rituals was initially suggested by paleontologist Dr. Martin Lockley, who had observed comparable marks in the vicinity. This new study significantly strengthens that hypothesis, uncovering over 30 different scrape marks across various sediment layers.
The marks can be classified into two types: broad, shallow bowl-like impressions and narrow scrapes. It appears many were produced during movements involving rotation and kicking actions by both feet.
Drone imagery from the 2019 US Geological Survey and subsequent follow-up surveys enabled the team to map the site accurately, as access to the area was strictly controlled.
“This was a remarkable discovery,” remarked Bunting, who collaborated with Lockley until his passing in 2023.
“Our excitement was palpable. Upon reviewing the drone footage, we immediately spotted scuffs covering the entire screen. It truly felt like a ‘Eureka!’ moment for me.”
While the exact species responsible for these markings remains uncertain, Bunting speculates that based on nearby fossil footprints, Acrocanthosaurus—a predator similar to T. Rex—and ostrich-like ornithomimids could be possible contenders.
Bunting argues that it’s improbable T. Rex would engage in similar courtship behaviors, as such rituals necessitate complex social dynamics likely associated with group herding and movement.
Bunting aims to revisit other possible LEK sites in western Colorado to reassess initial interpretations of the scuff marks found there.
If verified, these marks could provide significant insights into the reproductive behaviors of dinosaurs, revealing not only their mating practices but also their competition for partners.
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About our experts
Dr. Caldwell Bunting is an alumnus of Old Dominion University. His research has appeared in journals such as Sedimentary Geology and Cretaceous Research.
Source: www.sciencefocus.com
