Conservation International

whales and other marine animals may play a major role in the worldwide transport of nutrients — from the cold, rich waters of the deep to the warm, nutrient-poor surface. Without these key ingredients, much marine life would cease to exist.

A study published in July in the journal Biogeosciences Discussions estimated that a mere 80 sperm whales that live near Hawaii transport 1,100 tons (1 million kilograms) of nitrogen per year with the movement of their massive bodies through a boundary called the pycnocline, below which it is too dark for light-loving plants — the base of much of the ocean food chain — to survive.