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OMFG this Crocodile is HUGE

DAMN, NATURE!
Jinxsays...

Same logic: What are we then?

I was gonna say that Crocs haven't really changed much since the Cretaceous, but that would actually be a little bit of a lie. They are quite complex really, its just that their outward appearence is much the same, well, because water hasn't changed much. They adapted to be an amphibious ambush predator, the design worked 80ish million years ago, it still works.

bamdrewsays...

I understand why this is confusing as hell;

http://science.kennesaw.edu/~jdirnber/InvertZoo/LecIntro/TreeTime.jpg

... here is a relatively straight-forward 'evolutionary tree' cartoon,... the biggest thing to note is the Time axis... you have to trace the lines to see where species diverge and then look around to see if that line split happens before other line splits with respect to the Time direction.

Even in this simple diagram, you have to look at it for a minute to realize that reptiles, birds and most of the dinosaurs we think of split off from what became mammals, then reptiles split off from that group, then some dinos split off, then birds... So this is to illustrate that the split between what became mammals is farther back in time than the split separating birds and most dinos, and birds and reptiles. So this illustration really functions like a family tree, showing relationships with time and allow you to pick out that birds are closely related to dinosaurs, and that we have to go pretty far back to see where animals diverged into what became mammals and what became reptile/bird/dinosaurs.

If you're interested you should look for bigger ones trees,... when you start including plants, bacteria, archaebacteria, etc.... stuff gets pretty wild because you're reaching the edge of the science... and the complex smaller trees that just cover one group of critters can be really interesting to see... so much variety.

Oh, last note for transparency; they generally make these 'family trees' by researching comparative anatomy and tons of fossils, but have been using DNA to produce new and correct old 'phylogenetic trees' for 20 or 30 years now.

(image from this page, which focuses on terminology, but has good pictures: http://science.kennesaw.edu/~jdirnber/Bio2108/Lecture/LecPhylogeny/LecPhylogeny.html )


>> ^Jinx:

>> ^heathen:
>> ^Jinx:
Same logic: What are we then?

Mammals - which birds aren't and dinosaurs weren't.

Yes ok, but Mammals are as much Reptile as Bird are Dinosaur.

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