From a reddit thread: statue weight is one and half times corpse weight and some monsters that don't leave a corpse are defined as having mons[].cwt==0 so statues of those weighed nothing. Rather than assigning a non-zero corpse weight to every type of creature, statues that weigh less than an arbitrary value based on monster size have their weight increased to that value. The weight of a statue of a killer bee jumps from 1 to 100, that of a leprechaun increases from 90 to 100, that of a yellow light is changed from 0 to 300, wraith from 0 to 500, and air elemental from 0 to 900. That last one is actually too low but making the formula more complex doesn't seem worth it.
155 KiB
155 KiB