Adam Clarke on Psalms 74:14

The heads of leviathan - Leviathan might be intended here as a personification of the Egypttan government; and its heads, Pharaoh and his chief captains.

To the people inhabiting the wilderness - Probably meaning the birds and beasts of prey. These were the people of the wilderness, which fed on the dead bodies of the Egyptians, which the tides had cast ashore. The Vulgate, Septuagint, Ethiopic, and Arabic read, "Thou hast given him for meat to the Ethiopians," or Abyssinians.