for some unknown reason nature tends to prefer crabs the idea of a crab or morphological crab has evolved on the planet several times in the last few hundreds of millions of years in other words for some unknown reason this right 00:03:07 here seems to be kind of successful so when we talk about crabs we don't just actually talk about one species in reality this particular morphology applies to a lot of different species so for example this kind of a crab that you see is kind of different in terms of a 00:03:20 lot of components including genetics from for example a hermit crab it just so happens that for some reason nature tends to re-evolve crabs over and over similarly we know that the idea of flight evolved in the panelists several 00:03:33 times as well and this of course includes the idea of wings they seem to exist in for example insects they also exist in reptiles they also exist in birds so this also seems to be an evolutionary advantage that repeats 00:03:45 itself many times and more recently there was actually a study from just a few days ago where the scientists discovered that well the idea of saline or the stuff that snails have but also the stuff that's in our mouth so basically our saliva is also 00:03:57 exceptionally successful in terms of evolution a lot of different species including mammals independently evolved all kinds of different slime because it just seems to work so well on the planet and it seems to serve so many different 00:04:09 purposes