This is the twenty-second instalment of the Fortnightly Topic Challenge described here, with topics suggested and voted on here. This fortnight's topic is (suggested by Gordon K), and will span from the the 12th of December to the 25th of December. During this period, we will compile the list of questions with this tag and post it as an answer to this question.

In the meantime, please go and propose and vote on future challenges!

Everyone have fun, and happy puzzling!

Link to other Fortnightly Topic Challenges.

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    $\begingroup$ Gosh darn it you're fast. $\endgroup$ Dec 12, 2016 at 0:01
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    $\begingroup$ What's with the downvotes? ...weird. Are people over fortnightly challenges or something, or just unhappy that "animals" is the topic? $\endgroup$
    – Alconja
    Dec 12, 2016 at 13:24
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    $\begingroup$ @Alconja Didn't downvote, but maybe they disagree with the creation of the animals tag just for this challenge? Whether or not it is a good tag should be discussed in it's own meta post, though. $\endgroup$ Dec 12, 2016 at 14:38
  • $\begingroup$ Sorry to intrude, but would my puzzle be considered acceptable for this challenge? I never participated before so I am not sure how to proceed... puzzling.stackexchange.com/questions/46874/… $\endgroup$ Dec 20, 2016 at 5:11
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    $\begingroup$ @stackreader As long as it fits the tag description, it's also acceptable for this challenge. You can A) Wait until someone adds it (usually happens very soon, except when it's UTC night), or B) Add it yourself in the given format. In this case someone already added your entry by now. $\endgroup$
    – user14478
    Dec 20, 2016 at 10:26