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Use "whalefishes" in a sentence
"They found that even though they look different, the Mirapinnidae (tapetails), Megalomycteridae (bignose fishes) and Cetomimidae (whalefishes) are really the same species."
"Where there's ice and snow and the whalefishes blow"
"Megalomycteridae (bignose fishes) and Cetomimidae (whalefishes) are really the same species."