Mother goats can remember their kids' voices more than a year after they have been separated, a study has found.
Researchers recorded calls made by five-week-old pygmy goats and played them back to their mothers.
The mother goats were able to recognise their individual kids' calls after as long as 12 to 18 months.
Study leader Dr Elodie Briefer, from Queen Mary, University of London, said: "Because of the difficulties involved in following the same individuals over years, long-term recognition has been studied in only a few species.
"Our study shows that animals remember socially important partners."
The research is reported in the journal Proceedings of the Royal Society B.
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