English (Source)
These are the invaders which are currently attacking. The list is updated at the end of each wave, and each invader remains in the list for 5 waves. Keep an eye on what's attacking you so you can counter them accordingly.
Spanish Translation
Estos son los invasores que están atacando actualmente. La lista se actualiza al final de cada oleada y cada invasor permanece en la lista durante 5 oleadas. Estate atento a lo que te ataca para contrarrestarlo en consecuencia.