Ernst Haeckel who was the proponent of recapitulation theory ("ontogeny recapitulates phylogeny") which claims that an individual organism's biological development, or ontogeny, parallels and summarizes its species' evolutionary development, or phylogeny. It is suggested that he fudged the above drawings to make them more closely support his theory because they aren't quite accurate. I remember being taught the recapitulation notion and thinking it was a really neat idea. Well, neat it is but accurate it isn't.
However, take a look at these illustrations of two embryos...one human, one pig.
here, and they are attributed to a medical textbook and are apparently accurate. I am presuming the one on the left is the human but since the author on the website doesn't specify (that I saw) which is which, your guess is as good as mine. If you like these guessing games, here is another one with answers included.
Nature isn't into "neat", nature is primarily interested in results, not how something looks. We are all animals, our ancestors were all subject to the same environmental and evolutionary pressures that resulted in each species of animal possessing the particular bundle of behavioral and anatomical characteristics that distinguishes them. Many of these characteristics overlap and are similar between species and some do not and aren't very similar. Nature doesn't much care how easy or difficult it is for us to identify and/or understand her workings.
But...anyone that looks around at the amazing plethora of different life forms on Earth and somehow believes we human animals aren't the product of exactly the same process that resulted in all the animals...well someone thinking like that has little evidence to support their position as well as likely having some serious reality-testing issues.
My inspiration for this post occurred because the Haeckel drawing was floating around on facebook as an illustration of how closely related all the animals are. Well, we're all closely related and while that illustration isn't particularly good evidence, take a look at this one .
|Human soft tissue tail.|
You're an animal, I'm an animal, Bobby Ray (one of the cat beings that resides with me) is an animal...we're all animals...so let's just all get along...and to do that we human animals have to live as ethical vegans. That's really not so tough...and...being vegan makes us much better at being able to be neighborly to our fellow animals.