They release dragon caves 15-20 minutes after an hour. Also every 5 minutes.

Also will give descriptions for holiday dragons even though they have been over.
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Rares~
Valentine Egg= This egg is speckled and really fragile.

Vampire Dragon: This egg seems cold and dead.

Christmas 2007 = This egg gas festive colors and a holly leaf stuck to it.

Christmas 2008= This egg has festive markings.

Leetle Tree= Oh My. There is a leetle tree among the eggs.

Neglected Dragon= This egg looks sickly and untaken care of.
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New Releases that still exist~

Frill Dragon= This egg has strange markings on it.

Geode Dragon= This egg is heavy and feels like if made out of rock. (They way to get a
geode is to breed Stone Dragon X Stone Dragon)

New Pink Sprites= It's bright and pink.

DayDream Dragon =This egg is sitting on a cloud.

Sunset Dragon=This egg is glowing as brightly as the sun.(egg hatches at nightime)

Sunrise Dragon=This egg is glowing as brightly as the sun. (egg hatches in the daytime)

Balloon Dragon= This light egg is floating in the air.

Red/Purple Dorsal Dragons=This egg has multiple bands of color on it. (to get red or
purple is random)

WhipTail Dragons= This egg shakes from time to time, as if it is eager to hatch.

White/Red/Green/Blue Striped Dragon=This egg has brightly colored markings on it.  (You
have to breed certain dragons with the white stripe to get blue, red and Green stripe
dragons.)