The Squid-head itself is barely visible. Only the big metal plate surrounding its head, a series of tubes and some odd gray flaps on the side of its body which surround it. It is possible it uses these to propel itself forward.
Aside from this, it also has a bunch of tentacles. How many is impossible to see, but it seems to have six.
Squid-heads will just lie in wait for an enemy and then slowly swim close to it for the kill. They do not appear to be very fast or active Metal Heads.
It is capable of electrocuting an enemy with its tentacles.
It will grab and latch onto an enemy where after it is electrocuted.
The Squid-heads are not very fast, simply move on and don't get in their way.