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Question about ebird alerts

6:01 am

Does anyone know why sometimes a rare bird will show up for days or weeks in an unexpected area, but never show up on the ebird alerts messages?  For example there is a Cattle Tyrant, a rare South American Flycatcher that has been in Southern TX for a month or so that has never shown up on any of the ABA Rarities lists.

What makes some rare ebird sightings show up on the alert lists, and others seem to be skipped for a long long time or forever?
-Roger Uzun