According to Birds of the World Encyclopedia, the Diet of the Cetti's Warbler
consists mostly of damselflies (Odonata), aphids and other bugs (Hemiptera), earwigs (Dermaptera), adult and larval moths (Lepidoptera), caddis flies (Trichoptera), flies (Diptera), wasps (Hymenoptera), beetles (Coleoptera), spiders (Araneae), harvestmen (Opiliones), snails (Gastropoda), earthworms (Oligochaeta) and mollusks; occasionally small seeds. [1]. So, seeing it hunting fish something new...
[1] Clement, P. (2020). Cetti's Warbler (Cettia cetti), version 1.0. In Birds of the World (J. del Hoyo, A. Elliott, J. Sargatal, D. A. Christie, and E. de Juana, Editors). Cornell Lab of Ornithology, Ithaca, NY, USA. [ Ссылка ]
