mix...@bigpond.com wrote:

The point I have been trying to make, is that no telepathy is required for this,
just sharp eyes and a sense of self preservation.
Probably. But you never know with birds. They can sense magnetism, for example, which they use to migrate. Who knows what else they can sense.

It is not inconceivable they use some sort of RF signaling.

- Jed

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