Blood Effects

Blood effects were a feature in spore back in 2005, however as EA took control over the project many features were removed to make the game more appropiate to kids (much to fans dislike). Other features were added like the eyes on cells we see today. In the 2005 demonstration of sporethat was lead by Will Wright, blood effects were part of the creature stage and perhaps other stages.

Creature Stage
When Will Wright lead his Willosaur in the creature stage it was shown attacking a smaller creature and blood did come out of the prey. Will Wright was then able to pull the creature's head off. (this method of killing was also removed because it was too violent). The willosaur was then able to eat the creature more realistically than it does now, with bloody meat and the ability to drag the body away.

Tribal Stage
It is unknown if there were blood effects in the tribal stage.