A single sighting of an Orange-bellied Parrot was made in 1992.

A single sighting could be a fluke or a prank, but two that close together sound awfully legitimate.

So far, they have not received a single plausible sighting of any of them.

After that, there has not been a single undisputed sighting of the ivory-bill.

Lancashire police have so far failed to come up with a single positive sighting of him since.

For the next two days they pressed on, sailing deeper into the whaling grounds, but without a single sighting of their prey.

It may be that the fairy people discover love in a single sighting, but it doesn't happen that way with me.

Every police officer in the city has his name and his picture, but we don't have a single sighting of him to follow up.

Or you wouldn't be taking so much interest in a single sighting.