Island of the Blue Dolphins

From the text:

The cliffs here fell away easily to a wide shelf that was partly covered when the tide came in. It was a good place for sea elephants because they could crawl half-way up the cliff if the day were stormy. On fair days they could fish among the pools or lie on the rocks.

The bull is very large and often weighs as much as thirty men. The cows are much smaller, but they make more noise than the bulls, screaming and barking through the whole day and sometimes at night. The babies are noisy, too.