
Daniel and Kelly’s Extraordinary Universe Why do animals cooperate?
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Feb 19, 2026 Dr. Nathan Lentz, an evolutionary biologist who studies human evolution and cultural behavior. He explains human generalism, division of labor, and cumulative culture. Conversation covers fossil and archaeological evidence for care, revived views on group-level competition, and why social bonds (and isolation) profoundly affect health and development.
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Squirrel Alarm Calls Favor Relatives
- Female California ground squirrels call to warn relatives when predators appear, risking their own safety.
- They call more when nearby individuals are kin, showing context-dependent alarm behavior.
Why Bees Sacrifice For Sisters
- Haplodiploidy in hymenopterans raises sister relatedness to ~75%, favoring extreme worker altruism.
- High genetic similarity among sisters helps explain bees' lethal defense behaviors.
Mutual Gain And Delayed Payoffs
- Mutualism and postponed benefits can produce cooperation among non-kin.
- Subordinates may help dominant nest-builders expecting future inheritance or promotion.



