XCOM: Enemy Unknown - Sectoid

Sectoids are the first known species to contact Earth. Sectoids tend to run in packs, and can be identified by their high-pitched speech patterns. Although they are fairly short by human standards, they are incredibly intelligent.

Sectoids have the ability to form a psionic link with each other, and once the link is formed, they all receive combat boosts. By eliminating the sectoid forming the link, both sectoids will die.