They claim the rare sightings are due to the creature's green skin, allowing it to blend into the surrounding area.

Birders recently spotted a golden eagle, a rare sighting in this area.

It was a rare local sighting and a reminder of how much he's been missed here.

This was a rare sighting - I had only occasionally seen the two of them show public affection.

Reports claiming the creature to be real state that the rare sightings occur in Cambodia.

For many years Noctiluscent clouds were a very rare sighting, but over the past 20 years they have become more common.

Before that, our paychecks had been rare sightings, like shooting stars.

Several sightings of wolverines, rare within the United States, have been recorded since the 1990s.

We then hear over the radio that there are cheetahs about 20 minutes away - a rare sighting in these parts.

This could explain the very rare sightings (a family of plesiosaurs, for instance, would surely be seen more often).