They were headed to the Amami Rift hydrothermal vent field, an area where extremely hot water heated by magma bursts from ... → Big-headed flying creatures — with spotted bodies — found ...

Graeme: No! Bring them on!!! Even the Magma Creature from The Caves Of Androzani Rachael: What do enjoy most about your work on Doctor Who, and what do you think Steven Moffat will bring to the show?

The Horta were an illustration that there are plenty of life forms in the Star Trek universe that are not remotely humanoid.