And finally GT:
(note each limb has six manipulators the following are in addition)
Each of the Hiver’s six eyes is mounted on its own slender stalk, one in each inter-finger gap. The stalks are flexible and independently moveable, allowing the Hiver to look in six directions at once. However, to allow binocular vision and depth perception, Hivers generally use the eyes in three pairs. The eyes can be retracted into the fleshy lids at the end of the stalks for protection and routinecleaning, which the Hiver does automatically every few seconds. When extended, the eyes are about two-thirds exposed, giving a somewhat “bug-eyed” appearance.
The combination of mobile eyes and manipulative digits on this limb make it an extraordinarily useful tool for Hivers. Objects or tools can be held by the prime limb, examined at close range by the eyes, and manipulated with very fine control. Since the Hiver can insert this unified examination-manipulation limb into places it cannot take its bulky body, this provides a capability not available to Humans with their separate heads and hands.
Six further sensory organs are mounted on the prime limb, in a ring around the “neck” or “wrist” of the limb behind the base of the fingers. These are externally indistinguishable from each other, but three of them are ears and the other three are infrared sensors, placed alternatively. These organs are sited to the rear of and between the eyestalk bases – i.e., behind the backs of the fingers. This leads Hivers to close their prime limb fingers to unblock these organs when they attempt to listen to something or see something in the dark.
The author of MGT AM2 has got it very very wrong
Hivers have six eyeballs on their primary limb<correct>. Three see in the usual visual spectrum, three in the infrared<WRONG>. Between the eyestalks and a little behind them are six ears.<WRONG> This limb can be used for stability when moving but as this restricts vision it is more common for a Hiver to walk on five limbs with the ‘head’ up. Hiver hearing is roughly the same as that of humans but peak response is in the very low frequencies. Hivers have no vocal chords, relying on visual signals for communication.
So is this a deliberate change from 3 distinct canon sources, is it the author taking artistic licence, is it the author not doing thorough research, is it the author using their head canon or vague memory instead of looking it up?