The poptop? I belive you can in the current nightly. So, unless they change it, you should be able to capture it in the next big stable update.
It would sure be nice to be able to catch some of the bigger ones, though. and heck, it may be a bit far-fetched, but maybe birds, too? One things for sure, i'd sure like to catch me a few Smoglin.
Happy new year! I would've said so earlier, but for some reason I couldn't connect to the Starbound website nor the forums!