They weigh around 50-75 pounds.
Up to 4 pounds
300 kg. at maximum
The grey-white faceless aliens are called Pictorians.
No aliens have ever been observed by a credible witness.
Grey wolves weigh between 20 and 68 kilograms, so they range between the size of a child or a thin adult human.
An average male Eastern Grey Kangaroo may weigh up to 66 kg while a female weighs around 32 kg.
Aliens, in any colour, have never been observed by any credible witness.
If he ever did, he never discussed it