Name: Darwin visits a vanished Native American civilization in Oklahoma @StanEvolve
Uploaded: 2023-07-07T01:29:31-0400
Duration: 8 min 17 s
Description: At Spiro, Oklahoma, there is a little hump of dirt. It was once a big pyramid at one of the most important cities in the Native Mississippian culture, about 800 years ago. It was looted and dynamited in the 1930s.

Darwin and plants that look like pebbles @StanEvolve

Uploaded January 2026 | Updated September 2026, 1 week ago

Some plants in the deserts of South Africa look like pebbles. This can be considered mimicry. The plants have evolved to look like rocks so that hungry, thirsty herbivores will walk right past them and not notice them!

Darwin and plants that look like pebbles

Darwin visits a vanished Native American civilization in Oklahoma