Pam fod cynifer o slefrod môr ar ein traethau? Mae Aled yn cael cwmni Dr. Gethin Thomas. Why are there so many jellyfish on the coast? Aled is joined by Dr Gethin Thomas. Show more
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Pam fod cynifer o slefrod môr ar ein traethau? Mae Aled yn cael cwmni Dr. Gethin Thomas. Why are there so many jellyfish on the coast? Aled is joined by Dr Gethin Thomas. Show more