Question for the Curator: Did Leonardo have a Crop?


July 15, 2009
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We recently received a question through our YouTube channel asking about Leonardo the Mummified Dinosaur. Our viewer wanted to know what evidence there is to support that Leonardo might have had a crop. We passed the question along to Dr. Bakker, our visiting curator of Paleontology.

“In most of the articles I’ve read about Leonardo mention is made of evidence of a crop. Can someone tell me the nature of that evidence? Is the evidence sufficient for a near certainty, a likelihood or only a possibility?”

leo-head-sculpt2

A crop in today’s birds is a specialized pouch, an enlargement of the gullet, where food can be stored before final swallowing. Sometimes there are glands; sometimes not. Usually there are muscular walls and partial partitions so the bird can control swallowing and regurgitation.

The throat skin in Leonardo is distended below the jaws in the region where a crop would be expected to be if Leo were a big turkey. The distention is globular, swollen side-to-side, and not flattened, and the skin shows only weak indications of folds and furrows. That’s why everyone, from the very beginning, labeled this distention a “crop”.

leo-in-chamber-delin2The hi-energy x-rays showed no internal structures here. And there were no small ferrous-iron specks of the sort seen in the stomach and intestinal zones, where masses of chewed vegetation were packed. A chip was removed from the crop, exposing some of the interior – there were no masses of vegetation. The distention was filled with very fine, very clean sand.

Next time we x-ray Leo, we will probe the interior of the “crop” with greater intensity.

Other duck-bill mummies do show a distention in this area but these specimens are flattened side-to-side so the distention appears more like a dew-lap than a crop. Leo is unique in showing so much three dimensional preservation of internal cavities.

One of many lingering mysteries in Leonardo….

Bob
Authored By Bob Bakker

The Museum’s Curator of Paleontology, world-renowned Dr. Robert T. Bakker (or, as some call him, Bob) is the leader of the handful of iconoclastic paleontologists who rewrote the book on dinosaurs three decades ago. Along with other noted paleontologists, Bakker has changed the image of dinosaurs from slow-moving, slow-witted, cold-blooded creatures to — at least in some cases — warm-blooded giants well-equipped to dominate the Earth for 200 million years. Dr. Bakker can be found all over the globe, notably leading the Museum’s paleontology field program.

2 responses to “Question for the Curator: Did Leonardo have a Crop?”

  1. Francesca says:

    Hi,

    I was just wondering what happened to Leonardo after the exhibit left HMNS. Do we own it? If so, is it in collections/storage? Also, do you think it will be on display again in the near future?

    Thanks,
    Francesca

  2. Steven says:

    Francesca,

    Thanks for your question. Leonardo is headed back to his home in Montana. A cast of his body will be put on display at the Houston Museum of Natural Science at Sugar Land by the end of June 2010.

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