Parademon

Parademons are an army of demonic extraterrestrial beings artificially engineered by Darkseid of Apokolips, and make up his shock troops.

Biology
They don't originate as a single species, but are created from other beings (dead or alive, mostly taken from the populations of conquered worlds) who are converted into Parademons by nanotechnological implants, before being conditioned and trained by Desaad. They're extremely loyal to their masters.

In some cases, they are capable of assimilating others as well in order to increase their numbers. They're typically equipped with wings and razor-sharp claws, and possess superhuman strength and pain tolerance.