It's not really confusing - once a *species* is accepted onto the list as having occurred and having the realistic potential to have done so without a boat, then subsequent *individuals* of that species are acceptable, even if they are *known* to have arrived on a boat.

They can, and do.

It's that step up that's astonishing. Tipping point? We'll see.

Would be very interesting to see the original notes and sketches of the *accepted* Swainson's Hawk in (?) Norway....

Definitely not Russia then.