Researchers perform a necropsy on a sperm whale in Lynn Canal this week. This was the first sperm whale carcass found in Lynn Canal. Scientists believe the whale was killed by a large boat propeller. Photo courtesy of Julie Speegle.

For the first time on record, a sperm whale carcass was found in Lynn Canal.

This is the third time since 1990 that researchers from the National Oceanic and Atmospheric Administration (NOAA) could necropsy…