1. what if we've been putting them together upside-down, and they were all exclusively aquatic and that was their keel? :D

  2. it's the evolutionary response to raising your hand in a crowd so your buddies can find ya... but your arms are short and your shoulder socket doesn't do that sort of thing.

  3. Since the sail is supported by bony spines and bone needs specific neutrients to grow, the males with the largest sails would be more healthy and in turn, more attractive to the females of the same species

  4. Amargosaurus was a sauropod with an impressive pair of neck sails, though whether they were sails or spikes or a bit of both is still up in the air

  5. I thought sails were generally accepted to have had to do with body temperature regulation? Or has that reasoning changed lately?

  6. Simple creatures that judged what they could kill purely on height. Some flightless birds (e.g. the cassowary) still use this heuristic.

  7. I was taught, and by taught I mean I made it up, that they are drawn upside down and these are keels rather than sails.

  8. To my knowledge, there’s still quite a lot of debate about why veiled chameleons today have sail like casques on their head. One view I’ve heard is so that water trickles down to their mouth, but I’m not convinced (2 veileds and a dozen chams). The veileds also “pancake” to flatten themselves out to capture more uvb / heat from the sun, making their body shape similar to the sail shape.

  9. The graphic says 'Early Permian animals'. Did the sails fall out of fashion by the time of the End Permian event?

  10. Isn't it the same as a dorsal fin on a fish or the spikes on the back of many reptiles? To appear more threatening, larger, for stability purposes in the water, for venom, or for protection from larger predators?

  11. Not the most knowledgeable but, wasn't it said to help in temperature regulating in some animals and also used as an aid during mating season. !

  12. My question is this, how do we know the sails were fixed? Why couldn't they be collapsible and only used when needed (ie., defensive display, sexual display, heat regulation, etc.)? Do the fossils tell us the joints were fused to keep them up?

  13. Why do Sailfish and jellyfish have sails? Or fish that fly for that matter. Evolution was trying out a new design. Working out the kinks as they say. Why did some evolve in the oceans, migrate to land then return to the oceans. Who knows but evolution and time. We probably won't have more than a generalized fragmented picture of why evolution, over millions of years created or abandoned certain physical features of the evolutionary process in the development of life on our planet. As we are the new "kids" on the block in this ever evolving creation chain, who knows what our physical being will become in a few million years.

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