sentences:  For example, "Bombus affinis", a bumblebee endemic to North America, has decreased in nearly 90% of its natural habitats, much of which has been attributed to the use of neonicotinoid based pesticides.Previously undetected routes of exposure for bees include particulate matter or dust, pollen and nectar.Bees can fail to return to the hive without immediate lethality due to sub-nanogram toxicity, one primary symptom of colony collapse disorder.