the Berasit Hebrew Dictionary

ועופ

'oyop' means “flying”.

Although most translations render 'oyop' as “birds”, the adjective “flying” fits the contextual usage much more cleanly.

Many references to 'oyop', including oyop semim and mayim oyop strikingly non-birdlike.

Rather than 'oyop', xeper is the Hebrew word for “bird”.

see also oyopep

LexID 5775