Grandes migraciones: las ballenas (Great Migrations: Whales, Spanish Edition) (National Geographic Readers, Level 3)

In a world of changing global temperatures both on land and in the sea, the annual migrations of animals include amazing stories of incredible strength and the will to survive. New technology for tracking animals is helping us to understand the world in constant motion. This journey follows the sperm whale as it travels in packs through the deep blue ocean.