Commentary for Genesis 1:23
וַֽיְהִי־עֶ֥רֶב וַֽיְהִי־בֹ֖קֶר י֥וֹם חֲמִישִֽׁי׃ (פ)
And there was evening and there was morning, a fifth day.
Radak on Genesis
והעוף ירב בארץ, the emphasis here is on the word הארץ, i.e. even though its origin is in the waters the birds will grow and generally behave more like land-based creatures.
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