Babblers everywhere !
I was thinking about babblers upgrade for hives in late game. When upgrades, babblers would randomly spawn every peroid of time around hive until they reach spawn limit. They will defend the hive and support alien units. In addition, babblers would be a meatshield for alien units. When some alien comes to the hive, babblers would jump on him, giving him protection, as it works like now. Babblers are so cute ... let them live !