Birds’ building behaviour and the shape of the structures might be the result of social interactions.
Articles on Weaver birds
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The study shows that bird mothers can adjust egg size depending on their social conditions. This counters the idea that, with more help, mothers lay smaller eggs.
How can animals, from ants to people, form social groups with individuals working successfully together for a common good? So Charles Darwin asked in 1859, perceiving the existence of cooperative behaviour…
