What do River Deltas and Bacteria have in common? The way that they branch.

Left, a branching colony of Paenibacillus sp bacteria on an agar plate. Photo credit, Tomislav Vološen, (thanks @EvolvedBiofilm). Right, a satellite image of the branching network of the Wax Lake Delta, in coastal Louisiana. Bottom, snapshot of the model of the growing channel network (white), light blue lines are flow lines, blue colors are water surface.
Take a look at this fossil Pterodactyl from Germany in the Houston Museum of Natural History. The black growths on the edges of the fossil are Manganese “dendrites” that are part of the same family of processes described above.

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