'Sea monster' in the Bible

The beast of the field shall know me, the sea monster and the daughters of the ostrich: for I gave waters in the desert, rivers in the waste to give drink to my people, my chosen.

Rouse up, rouse up, put on strength, thou arm of Jehovah; rouse up as the days of old, of everlasting generations. Was it not with him cutting off Rahab, wounding the sea monster?