The nine Type D orcas were found on a beach in Chile, with a necropsy of one female showing it was a healthy adult, with no signs of human involvement in its death.
A strange and rare group of orcas has stranded on a beach in Chile — the first event of its kind in 67 years and only the second ever recorded.
Orcas are divided into at least nine different sub-groups, or"types," spread all over the world. But Type D orcas — which have smaller white patches by their eyes and rounded"melon" heads — are some of the most unique.Scientists first came across Type D orcas in 1955 when a group of unusually shaped killer whales washed up on a beach in New Zealand.
The scientists aren't sure why the nine orcas died or ended up on the beach. Whales might strand themselves for a variety of reasons, including illness or human use of underwater sonar, though the causes are not entirely understood. The team's analysis of the lone female orca showed it was a healthy adult. There were no signs of human involvement in the death, such as entanglement or a collision with a boat.
Other types of orcas are found as far south as Antarctica and as far north as Greenland. Some of these types' ranges overlap — but they don't appear to interbreed, or even necessarily interact with each other.
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