Secondary Products Revolution
Map: Afro-Eurasia showing the Eurasian Steppe. As the Great Arid Zone expanded, humans entered into a variety of symbiotic relationships that were drought and altitude tolerant. These animals were domesticated during the 4th and 3rd millennia BCE.
Camelids
Dromedary CamelImage Source: Dromedary Camel (Wikipedia). Extracted by Todd Black.
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Bactrian CamelImage Source: Bactrian Camel (Wikipedia). Extracted by Todd Black.
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Equids
HorseImage Source: Horse (Pixabay)
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DonkeyImage Source: Donkey (PNG Img)
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Ard Plough
Image Source: Ard Plough Flickr by Jørgen Håland. (Also, see Wacom Gallery). Extracted and colored by Todd Black. [Original image below).
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Image Source: Ard Plough (Wikipedia-- Public Domain)
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Wheel
Image Source: WikiFur: Llama. Extraction by Todd Black.