It seems to me like we're okay to start biweekly topic challenges here at Pets. The idea for these challenges can be found in this meta post, and the process has been nicely written out over at the Gardening and Landscaping post.
Suggest topics in the answers below.
Next monday, I (or a volunteer) will pick one of the topics and write up a new meta post introducing the challenge for the following week. The topic will be associated with a specific tag (or tag set) so that we can count how many questions were asked. Please use one topic per answer.
Anyone who wants to participate asks about the topic of the week.
At the end of the week, the organizer post an answer to the challenge with a count of how many questions were asked and anything else they feel like highlighting (like favorite questions or notable achievements).
The organizer picks a new topic and starts back on step #2.
This will keep going as long as there are topics suggested in the answers below that match the rules for the challenge. When an accepted topic has run through the time period for the challenge, the answer will be edited and marked as completed and the next highest answer will become the next topic for the challenge.
If the suggestion is for a tag, then it must be for an already existing tag with at least 3 questions using it. The couple times we've tried to create tags using the challenge it hasn't worked out very well.
If the suggestion is for a tag, then it must have a wiki attached. That way people who haven't used the tag before will know what it's for. It doesn't need to be perfect, just something to start with.
Suggestions Will be accepted into the challenge once they reach a score of 3 or more. That way I (or anyone else running the challenge) will know that there is at least a small agreement with the suggestion, and that it is potentially a viable topic for the challenge.