continue to build very similar nests just as 'closed-ended' song learners that learn songs only in their first year of life do not subsequently change their songs. Where this is the case, one should expect nests of the same species to be very similar with as much variation within a bird as among birds. Although young weaver birds take longer and build less… (More)
DOI: 10.1016/j.cub.2008.02.002


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