Surrogate parents of unrelated nestlings could forgo food while incubating eggs and foraging for chicks, and they lose weight. What makes them act in such a generous manner? Are they altruistic?
Studies show that, in general, people who feel good, do good – and likewise, people who do good, feel better. The rich are no exception.
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On two occasions, mother humpbacks with calves joined other humpbacks to chase away killer whales from sea lions. They even put their calves at risk.
Across cultures, children brought up in religious households tend to be less altruistic, a study published in the journal Current Biology has found.