"By using their own resin against them, Preserver bees are one of the few species that Murky bees allow uncontested into their territory - mainly because they have no idea they are there."
Codey's Notes give the following hint:
"This swamp species likes to gather the small sticky shards produced by the native Murky Bees to build it's dens."
It has a 38% of spawning.
When a Preserver Bee is selected in a Habitat and is given enough of the items it likes, they will leave when their visit finishes.