14 Oct '13, 12am
WATCH: Giant Squid Washes Up on Spain Beach
The giant squid is the largest known invertebrate on the planet, and their eyes can be as large as a human head, reports NBC News . It is believed that the enlarged eyes help the squid to better see in the darkness of the deep ocean. Researchers also believe that they typically live in cooler waters, where their blood is better able to carry oxygen. The giant squid is also known to have a complex nervous system and brain.