What would cause the temporary migration of a carnivore avian species, normally inhabiting a temperate to tropical region, to a much colder one
What would cause the temporary migration of a carnivore/scavenger avian species, normally inhabiting a temperate to tropical region, to a much colder one.
It's a seasonal migration, but also a rare one happening only in the colder winters.
They usually inhabit a large archipelago near my planet's equator, in the southern region of it since the equatorial zone is the middle of the ocean.
They are a type of flightless vulture as large as ostriches and as intelligent as parrots/crows.
They would have to run/walk over ice across islands to reach the continent, they are very fast, like ostriches. The path would only be possible in deepest winter and only very rarely.
It's unknown if by accident "humans" taught them the way or if they were just curious.
That's what I'm trying to determine. I know crows and parrots can learn things not natural to them, but would they act against instinct to satisfy curiosity? Or would they have to be pushed by something else.
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