On the 18th of December each year we re-release some of the site's older pets. Each user gets the chance to adopt a few randomly selected pets from earlier months or years, and these pets are usually very valuable or rare.
You may not recognize the pets you got from the Dec 18th gift, but they could be worth a lot! Make sure to find out what you have and what they are worth before you accept any trade offers for your Dec 18th pets.
We already have a "What pet is this?" topic, but to prevent that being flooded with all the Dec 18th pets we've made a separate topic only for December 18th pets.
Post your December 18th pets here if you want to ask which litter/month/year they came from or what their rarity is likely to be
This is a very busy topic so please read other peoples' posts to see if your question has already been answered by someone else who got the same pet.
Other useful topics:
Re-release discussion topic - Post here if you just want to talk about what you got.
Fair Trade Thread - Post here if you need advice about a trade offer you have received or sent
The Rares List - A list of the approximate order of the rarest pets on the site
How much is this pet worth? - a topic where you can ask other players what your pet is worth to help you understand its value in trades