In 2018, FIRE Lab re-purposed some blank postcards, adding fish sketches to them, and used them to build an outreach activity called #FishInThePost. The artwork and activity cross-posted on our blog and @FireLabTweets on Twitter. We tweeted out a question once a week about a freshwater fish species that is native to Welsh freshwater ecosystems, and the first person to tweet us back with the correct answer received a fish-art postcard in the mail. The outreach activity combined knowledge and stories about local fishes with sketches and drawings of the species. We used the activity as a way to grow the labs online presence and to engage with others about species and systems that inspire us and our work. Examples of some of the fish species sent in the post to activity contributors are shared below.