What is a one-sentence summary of the following article?
These dragons can only be bred during specific times, and some may no longer be available. If the dragon is available to purchase, it is available to be bred. Sometimes dragons from past events are available during special events. Limited Dragons Desired Dragon Parent #1 Parent #2 Time Availability Apocalypse Plant/Lightning Metal/Cold 20 hr Dec. 2012 Bearded Mountain Metal Hybrid 15 hr Father's Day Blue Moon Lightning Cold 30 hr Varies* Bone Earth Fire 10 hr Halloween Bouquet Flower Water 9 hr Mother's Day Butterfly Air Firefly 12 hr Late Spring Century Cold/Earth Water 10 hr Feb 2013 Clover Plant Moss 7 hr St. Paddy's Day Cotton Eart/Fire Lightning/Plant 24 hr Sep. 2013 Equinox Water Blazing 24 hr Spring/Fall Equinox Firework Fire Air 6 hr July 4th Ghost Cold Earth 15.5 hr Halloween Gift Cold/Fire Plant 12 hr Christmas Leap Year Hybrid Hybrid 14.5 hr Leap Years Liberty Copper Air Hybrid 30 hr July 4th Love Fire/Plant Lightning 5 hr Valentine's Day Lunar Eclipse Air/Cold Earth 48 hr Varies** Mistletoe Tree Lichen 8 hr December Motley Fire Plant 12 hr Mar. 2013 Panlong Fire/Water Air/Earth 36 hr Chinese New Year Paper Cold/Plant Fire/Earth 12 hr Sep. 2012 Reindeer Cold Plant 5 hr Christmas Sakura Tree Flower 10 hr Spring Terradiem Air/Earth Water 24 hr Varies Zombie Meteor Pollen 20 hr October * Usually available during blue moons in your area. Keep an eye on the market. ** Available during a lunar eclipse in your area. Keep an eye on the market.
Breed limited event dragons.