It will likely go away next patch
Whenever you have time, boot upHeroes of the Storm and check out this cute new Easter egg. It takes place in the Monk’s splash screen following the latest patch, and allows you to play a small little game of Duck Hunt.
As uncovered by HeroesNexus, all you have to do is click the tree to the right of the Monk and a bird will fly out — you’ll have a limited amount of shots to take it out, lest you get mocked by a laughing Treasure Goblin (inlieu of Duck Hunt Dog).
You don’t actually get anything from it, but it’s a fun way to spend a minute or so.