https://www.livescience.com/swordfish-stabs-thresher-shark.html?utm_source=notification
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Whodunit solved when 'sword' is found embedded in thresher shark

A swordfish (Xiphias gladius) left part of its "sword" sticking out of the shark it killed.
A swordfish (Xiphias gladius) left part of its "sword" sticking out of the shark it killed.
(Image: © The Ichthyological Society of Japan 2020)