You always hear these before you see them as you can hear groups cheering phrases such as "waheyyyy!" and "oi oi oi". It's rare to see one alone, in fact they often cluster in large groups with others of their kind as well as standard, non-sentient mushrooms. They're rarely a danger physically, but can be mentally damaging over time.
See the gallery for some scale pictures next to a 28mm miniature. They measure approx 28-34mm from bottom to top and work perfectly as characters, encounters or terrain.
Cast in high quality resin, single piece (x3) supplied unpainted. Made to work with 28mm scale minis, but depending how small or large you want them to be in your universe, they can easily work with other scales. Sculpted by Al Maguire.
Shown painted by Paul Ashby of Berlintuesday Studio