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sorry how can orcas be "invasive?"

Narwhals hung out where the oracs didn’t. Now the ice is melting giving the previous frozen ocean more ground for the orcas to go and they are now munchin down on narwhals

Please explain how Orcas are an Invasive Species? Orcas have free Reign over the Oceans - they can swim literally anywhere on the Planet...

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Oracas are predatory species. They attack pretty much everything. From small fish to whales.

That's not correct as there are zones that where so cold and icy that orcas were unable to live for long, these zones are now warming up

Orcas need air. Ice in the Arctic provided a barrier keeping them out and] narwhales in. With less ice, the orcas can penetrate further...hence, invasive species.

The big one is Hudson Bay is open water in the south and the narwhals used it as a breeding ground / feeding ground. The “entrance” is way north and is usually iced in. Orcas couldn’t traverse it, but narwhal could. Now receding sea ice allows the orcas to swim around, herd the narwhal groups to the shallows and just slaughter them.

how are they not?