Simplify the following text for a Grade 3 native English-speaking person.
Original: It is not clear how spiderlings manage to eat pollen however , since their mouths are not large enough to consume pollen grains . Some predatory mites also feed on pollen , with some species being able to subsist solely on pollen , such as Euseius tularensis , which feeds on the pollen of dozens of plant species .
Simplified: The pollen of some plants is very light .