Swarms of yellow butterflies

[saskcanfarmer]

I was driving around checking the crops this evening and every gravel road I went down there were swarms of yellow butterflies. t was a rainy hot humid day today. What is this for telling me?

[oldjim]

You smoked too much weed back in your hippie days?

[TOM4CWB]

"Yellow butterflies, about the same size as the cabbage butterfly, are also common in fields and wet places. A flock may be seen clustered at a mud puddle. These are Sulfur Butterflies, usually the Clouded Sulfur -- with wings pale greenish-yellow above, edged with dark brown, and sulfur-yellow underneath -- or the Orange Sulfur which is orange- yellow above. Their larvae feed on clover and alfalfa."

http://www.newton.dep.anl.gov/natbltn/100-199/nb194.htm