メジロムシクイ

Fikedora to iu no wa yoku wakaranai ga, Eiyaku de wa bekkafiko to natteiru no de, onaga mushikui ka mejiro mushikui no koto kamoshirenai.I am uncertain about fiquedora, but the English translation is “beccafico”, so it is likely the Dartford warbler or Orphean warbler.