Blue barrel cactus (Echinocactus ingens) in the Chihuahuan desert. An example of convergent evolution, whereby unrelated species developing in similar environments evolve into look-alikes. In this case, the cactus looks similar to an African milk barrel, which is not a cactus at all, but a spurge (Euphorbia sp.).
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Creative#:
TOP22245103
Source:
達志影像
Authorization Type:
RM
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須由TPG 完整授權
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N/A
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