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Mating season by T-PEKC Mating season by T-PEKC
A pair of mating Dacentrurus armatus. Pencil, 2009.

I made this drawing for Dinosaur International Illustration Contest 2009. The scene is not based on scientific facts just my own speculation about stegosaurs mating habits. I have always thought the mating was more complicated process for this group of dinosaurs because of all these plates and spikes. That's why I came up with this idea- back to back mating.

The pterosaurs are also speculative because I don't know about any pterosaurs from Portugal but still Rhamphorhynchoids were a common animals back in jurassic Europe.

I put a warning for a mature content (just in case), so if you're under age of 18, probably you won't see this deviation.

The original artowk was too big for my scanner so I scanned few parts of the drawing and later put them together. I tried to fix the contrast of each piece but this was the best result which I got. Probably later I'll upload another version with better quality but with smaller resolution.

EDIT: Link to the same work but with better contrast -> [link]
EDIT 2: A larger image; "Mature content" option swithced off. I don't think a pair of mating stegosaurs is such a big deal. Also nothing is visible in this case.
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:icondaizua123:
Daizua123 Featured By Owner Jul 7, 2013  Hobbyist Artist
That's really creative. I never thought of stegosaurs mating like this.
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:icont-pekc:
T-PEKC Featured By Owner Jul 10, 2013
Thanks!

Well, it just one of several options. Now, about 4 years after I drew this, I'm not sure if this is the most parsimonious/probable among them, but it'a still one of those possibilities allowing the male stegosaur not ending up eviscerated.
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:icondaizua123:
Daizua123 Featured By Owner Jul 10, 2013  Hobbyist Artist
Yeah,but then again, it must be hard to get onto the female's back with those plates and spikes
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:iconhenrik9470:
henrik9470 Featured By Owner Mar 1, 2013  Professional General Artist
great thought
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:icont-pekc:
T-PEKC Featured By Owner Mar 2, 2013
Thanks!
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:iconhenrik9470:
henrik9470 Featured By Owner Mar 4, 2013  Professional General Artist
;) np
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:iconkazanlak10:
Kazanlak10 Featured By Owner Sep 6, 2010
Well the method of mating makes sense to me. in terms of the positions of the participants it is similar to the "copulatory tie" phase of canine mating actually. I think you may be on to something with this idea.
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:iconcarcharodontotitan:
Carcharodontotitan Featured By Owner Aug 20, 2010
So the male's penis is pointing backwards?
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:icont-pekc:
T-PEKC Featured By Owner Aug 27, 2010
Not necessarily. Just for example, as far as I know, most birds doesn't have penis at all. For them it's enough to reproduce just by "touch" their cloaca to each other. I think it's possible that some dinosaurs with heavy ornamentation on their backs mated like those birds. Anyway, this artwork is just a speculation. It's not based on any scientific papers.
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:iconcarcharodontotitan:
Carcharodontotitan Featured By Owner Aug 27, 2010
How does the sperm get in and stay in?
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:icont-pekc:
T-PEKC Featured By Owner Aug 27, 2010
Taken from Wikipedia:

"Although most male birds have no external sex organs, the male does have two testes which become hundreds of times larger during the breeding season to produce sperm.[13] The testes in male birds are generally asymmetric with most birds having a larger left testis.[14] The female's ovaries also become larger, although only the left ovary usually functions. However, if the left ovary is damaged by infection or other problems, the right ovary will try to function.

In the males of species without a phallus (see below), sperm is stored in the semenal glomera within the cloacal protuberance prior to copulation. During copulation, the female moves her tail to the side and the male either mounts the female from behind or in front (in the stitchbird), or moves very close to her. The cloacae then touch, so that the sperm can enter the female's reproductive tract. This can happen very fast, sometimes in less than half a second.

The sperm is stored in the female's sperm storage tubules for a week to a year, depending on the species. Then, eggs will be fertilized individually as they leave the ovaries, before being laid by the female. The eggs continue their development outside the female body.


A juvenile Laughing GullMany waterfowl and some other birds, such as the ostrich and turkey, possess a phallus. When not copulating, it is hidden within the proctodeum compartment within the cloaca, just inside the vent.

After the eggs hatch, parents provide varying degrees of care in terms of food and protection. Precocial birds can care for themselves independently within minutes of hatching; altricial hatchlings are helpless, blind, and naked, and require extended parental care. The chicks of many ground-nesting birds such as partridges and waders are often able to run virtually immediately after hatching; such birds are referred to as nidifugous. The young of hole-nesters, on the other hand, are often totally incapable of unassisted survival. The process whereby a chick acquires feathers until it can fly is called "fledging".

Some birds, such as pigeons, geese, and Red-crowned Cranes, remain with their mates for life and may produce offspring on a regular basis." [link]

I hope this answer to your question. :)
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:iconcarcharodontotitan:
Carcharodontotitan Featured By Owner Aug 27, 2010
What exactly is cloaca and how does the male's one look like?
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:icont-pekc:
T-PEKC Featured By Owner Aug 29, 2010
Dude, you should have studied this in your biology/science classes in school. Go to Wikipedia and type cloaca in the search engine. I doubt I could explain it better to you than Wikipedia.
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:iconcarcharodontotitan:
Carcharodontotitan Featured By Owner Aug 29, 2010
Ok then.
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:iconyoult:
yoult Featured By Owner Feb 8, 2010  Professional General Artist
Fascinating :) it's possible too that male Stegosaurids could have had a pseudo- or protopenis like modern ducks, ostrichs and so on.
I'm painting at the moment several images of the life of a Stegosaurus stenops male, from birth, to growth, to behavior, to mating season and to death.
I hope you'll get a look at them, when finished. :)
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:icont-pekc:
T-PEKC Featured By Owner Feb 20, 2010
Of course I'll take a look at them when they are finished. As for the protopenis, I have no idea. I just don't know much about archosaurs (crocs and birds) reproductive system.
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:iconderkompsognatus:
DerKompsognatus Featured By Owner Apr 2, 2009
I always wondered how they do it!
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:icont-pekc:
T-PEKC Featured By Owner Apr 10, 2009
You're not the only one who is wondering. Anyway, this is one of the possible ways.
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:iconzombiesaurian:
ZombieSaurian Featured By Owner Mar 21, 2009  Student Digital Artist
instead of putting a link of the better version, why don't you just edit the file for the uploaded one on here?
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:icont-pekc:
T-PEKC Featured By Owner Mar 27, 2009
Because the so called by me "better version" is with lower resolution and it is not very good too. I mean it doesn't matter very much which one will be uploaded.
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:iconemperordinobot:
EmperorDinobot Featured By Owner Mar 17, 2009
Too excellent for words.
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:icont-pekc:
T-PEKC Featured By Owner Mar 27, 2009
Hehe, thank you!
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:iconsteveoc86:
Steveoc86 Featured By Owner Mar 15, 2009
Amazing work.

I know I faved this the other day but for some reason the concept passed me. I was blown away by the quality of work, looking at all the details, I missed the bigger picture. lol
Just a few weeks ago I was thinking about dinosaur mating and came to the exact same conclusion. I can't imagine it working any other.
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:icont-pekc:
T-PEKC Featured By Owner Mar 27, 2009
First of all, thank you the fave! Second, thank you for the kind words. Your opinion has always been important for me. I'm really surprised that so many people have come to the same conclusion and actually think that my artwork is something more than just my own interpretation.
I'm happy to hear that I have made so detailed work and it made you to not notice the theme of it because of the details.
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:icondgylia:
Dgylia Featured By Owner Mar 15, 2009  Hobbyist General Artist
Fantastic work!!!!
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:icont-pekc:
T-PEKC Featured By Owner Mar 27, 2009
Thanks!
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:icondgylia:
Dgylia Featured By Owner Mar 28, 2009  Hobbyist General Artist
Welcome :hug:
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:iconbrokenmachine86:
BrokenMachine86 Featured By Owner Mar 14, 2009  Hobbyist Traditional Artist
Oh man, what an amazing work! Congratulations!... too bad about the scanner though.
About that pose, is a very nice solution, maybe the only one posible... I can't came up with another one.
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:icont-pekc:
T-PEKC Featured By Owner Mar 15, 2009
Thank you very much man!:)

I'm wondering what the contest jury will say about my drawing, especially for the pose. They are a few illustration of mating theropods and sauropods but as far as I know there aren't any with stegosaurids. The pose is just guessing based on my own understandings about this animals. It's good to hear that other people think that what I'm showing looks possible. But the problem "Is it anatomically possible?" still stays.
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:iconsinande:
Sinande Featured By Owner Mar 14, 2009
Not even pretending to be constructive this time.

AWESOME.

I love the idea, and love the lights. And, um, the whole thing is awesome. :worship:
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:icont-pekc:
T-PEKC Featured By Owner Mar 15, 2009
Thank you! :) I'm glad you like the drawing.
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:iconguilmon182:
guilmon182 Featured By Owner Mar 14, 2009  Hobbyist Traditional Artist
Here's how stegosaurs would f@ck in JP!...sorry, I had to...
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:icont-pekc:
T-PEKC Featured By Owner Mar 15, 2009
It's understandable. If I was on your place tprobably I would have to say it too. :lol: Anyway, I'm a little bit more serious about illustrations of mating dinosaurs. I mean I look at them from scientific point of view. ;)
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:iconguilmon182:
guilmon182 Featured By Owner Mar 15, 2009  Hobbyist Traditional Artist
I do as well, I just thought it'd be funny.
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:icont-pekc:
T-PEKC Featured By Owner Mar 27, 2009
Indeed. :)
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:iconthearchosaurqueen:
TheArchosaurQueen Featured By Owner Mar 14, 2009  Hobbyist Digital Artist
Very nice artwork :). And I love Dacentrurus, the 2nd largest known Stagosaur.
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:icont-pekc:
T-PEKC Featured By Owner Mar 15, 2009
Thanks!
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:iconraptorarts:
RaptorArts Featured By Owner Mar 13, 2009  Professional Artisan Crafter
Now this is a very unique idea. Ive always thought it was a proper mounting but you pose a good question. What about those plates? Hmm... Well you sure made me think twice about dinosaur mating habits. Well done :)
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:icont-pekc:
T-PEKC Featured By Owner Mar 15, 2009
I don't if this is unique idea but when it came to my mind I was like "How it didn't cross my mind earlier?". My main point was to try showing dinosaurs in unusual activity and if my drawing made you think about their habits I'm considering this drawing as success.
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:iconzombiesaurian:
ZombieSaurian Featured By Owner Mar 13, 2009  Student Digital Artist
amazing, you've really improved.
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:iconzombiesaurian:
ZombieSaurian Featured By Owner Mar 13, 2009  Student Digital Artist
well you were amazing before but I think you know what I mean
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:icont-pekc:
T-PEKC Featured By Owner Mar 15, 2009
I know what you mean. Thank you! :)
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:iconzombiesaurian:
ZombieSaurian Featured By Owner Mar 15, 2009  Student Digital Artist
oops sorry I accidentally clicked print request, I ment to click download to see full size
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:icont-pekc:
T-PEKC Featured By Owner Mar 27, 2009
No problem.
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:iconzombiesaurian:
ZombieSaurian Featured By Owner Mar 15, 2009  Student Digital Artist
your welcome!
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Submitted on
March 13, 2009
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