Assertion: sperm whale's dive | /r/HasProperty | 4,000ft
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text: average dives are 4,000ft · The mammals hold their breath for up to 90 minutes on the long dives · They eat around one tonne of fish per day · Their heads hold large quantities of a substance called spermaceti, the purpose of which is unknown · A sperm whale's life expectancy is 50 to 70 years.