Why does Columbus mention monsters and what did he say he found?

Columbus mentions monsters in his accounts to convey the dangers and unknowns of his voyages, as well as to evoke a sense of awe and fear about the uncharted territories he encountered. He described finding strange and terrifying creatures, which likely reflected both the unfamiliar wildlife of the New World and the myths surrounding oceanic exploration at the time. These descriptions served to captivate his audience and emphasize the perilous nature of his journey. Such accounts also reinforced the notion of adventure and discovery that characterized the Age of Exploration.