Dr. Michael Heiser explains the Hebrew word
tannı̂yn / tannı̂ym and what it meant to ancient people.
Manuscripts found in the ancient Canaanite city of Ugarit sheds light on the terminology.
Genesis 1 ESV
(21) So God created the great
sea creatures and every living creature that moves, with which the waters swarm, according to their kinds, and every winged bird according to its kind. And God saw that it was good.
Psalms 74 ESV
(13) You divided the sea by your might; you broke the heads of the
sea monsters on the waters.
(14) You crushed the heads of
Leviathan; you gave him as food for the creatures of the wilderness.
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19 minute video