Schizophrenia is especially rare in children under the ages of 7-8 years old.

Attempts were made to stock the zoo with especially rare and exotic animals.

Finding new companion stars is not an especially rare event in astronomy.

Especially rare is the block of four and naturally on cover.

This model was produced from 1978 to 1980 and is considered especially rare.

This was an especially rare event because it occurred during Australia's typically warm summer.

Another cue is having the same family name, especially if rare, and this has been found to increase helping behavior.

That's hard to find in any area but it seems especially rare in manufacturing.

What makes it especially rare is that taxpayers are not footing the bill.

These are especially rare and have sold for several hundred dollars apiece.