Sharks switching from tuna to humans?

A South Australian marine biologists said a decline in the shark's natural prey could be cause for the rise in attacks.

Dr. Scoresby Shepherd studies shark attacks in Australia and California. According to Shepherd, attacks that used to happen once every 30-40 years are now occurring once a year.

This is all fine, and it makes sense....but I wonder if he has looked at other factors in attacks that can be attributed to human behavior. Any thoughts?

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