In a somewhat unusual research project, scientists have found that sperm whale faeces may help oceans absorb carbon dioxide from the air.
Australian researchers calculate that Southern Ocean sperm whales release about 50 tonnes of iron each year.
This stimulates the growth of tiny marine plants - phytoplankton - which absorb CO2 during photosynthesis.
They note in the Royal Society journal Proceedings B that in the end, this also provides more food for the whales.
Phytoplankton are the basis of the marine food web in this part of the world, and the growth of these tiny plants is limited by the amount of nutrients available, including iron.
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