In this photo provided by NOAA Fisheries, a necropsy team on Saturday, 24 January 2015 measures a gray whale found dead beneath a dock on the Seattle waterfront earlier in the week. The necropsy was conducted by members of NOAA Fisheries' Marine Mammal Stranding Network. Biologists said the cetacean was struck by propeller of large vessel. Biologists are not sure why the whale entered Puget Sound, since most gray whales have already migrated south along the outer Washington Coast. Photo: Paul B. Hillman / NOAA Fisheries / AP Photo

SEATTLE, 24 January 2015 (AP) — A 32-foot gray whale that turned up dead under the Washington state ferry terminal in downtown Seattle died earlier this week because it was struck by the propeller of a large vessel, according to the initial results of a necropsy completed Saturday.

The necropsy found large, deep gashes on the whale's right side and back, indicating the cause of death. The gashes extended into the whale's body cavity and the propeller's force had sheared off one of its ribs.

Biologists estimated the time of death as no earlier than Monday and likely on Tuesday. They said the animal likely died quickly, probably within an hour.

The whale's body was discovered under the Colman Dock ferry terminal late Wednesday. Ferry service wasn't affected, but people reported a foul odor.

The examination also found that the whale was a juvenile female, about two to three years old. She was just over 30 feet long and had been in very good health before death because its blubber was thick, with healthy amounts of oil.

Biologists are not sure why the whale entered Puget Sound, since most gray whales have already migrated south along the outer Washington Coast. [more]

Dead whale found at Seattle dock struck by ship propeller

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