It is probable therefore that the tall, pointed plates were to protect the female stegosaurus whereas the wide plates of males were used to attract mates. Not all hens will have 'small' combs, but they will always almost always be smaller than the rooster's. Males have whisps of feathers coming out of their crest. However, it is much more difficult to prove in dinosaurs. The findings were published in PLoS One last week. I find the males look like they have mullets - business in the front, party in the back. The answer to this comes again from a living animal: Often times males have very tiny combs. You have to keep two lines of chickens, using fast feathering males and slow feathering females.
Given that inter-species co-existence is rare in modern animals, it was the first piece of evidence suggesting they might belong to the same species. Especially for those new to the breed. The biggest give away that you have a cock bird is by their crest.. Several theories have been suggested, including species differences, dinosaur age or gender. However, it is much more difficult to prove in dinosaurs. My Coop I have to admit, I am quite addicted to sexing chickens by appearances. The next stage was to determine the plate type for each gender and for this Saitta looked to the animal kingdom. Nov 4, 4 people like this. The first clue was that the remains of five individuals were discovered in close quarters. Whilst studying at Princeton, Evan Saitta carefully examined the iconic back-plates of Stegosaurus individuals, including five found buried together in Montana, to help solve the mystery. Males use them to compete but also protect themselves against predation. The tall-plated Stegosaurus and wide-plated Stegosaurus are not two distinct species but actually males and females! Males are typically bigger than females and invest more in ornamentation to attract mates, so it makes sense for the wide plates to be from males. Their hackles and saddles are longer - but not always obvious to someone buying a Silkie for the first time. Colour Sexing click to enlarge click to enlarge If you are buying birds over 12 weeks at a sale, check out these very clear differences between mature cockerels and pullets: The answer to this comes again from a living animal: Feel free to repost any of these images so long as they are not edited in any way. Not all hens will have 'small' combs, but they will always almost always be smaller than the rooster's. I am not into feather sexing day olds, or vent sexing - as I breed my own birds and feather sexing is very precise. I would love to have a collection of images for others to reference back to when trying to sex their own birds, or trying to help others. Proving sexual variation exists is a step towards getting a complete understanding of dinosaur behaviour. Fossils of Stegosaurus to date always have had one of two distinct plate types - either wide or very narrow - which until now has been unexplained. Gender variance was thus concluded as the only possible explanation. The physical differences between males and females are easily spotted in modern animals, for example in peacock's plumage and lion's manes. Naked Necks are especially easy to sex this way at least my line. By 12 weeks old the crest is noticeably different between the two sexes. Although there has been a lot of research into gender variation for all different types of dinosaurs, in most cases alternative explanations weren't fully explored.
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