My school has plenty of inch-long little black and yellow caterpillas roaming around everywhere. Yeap... everywhere. One moment one caterpillar would jaywalk across the carpark. Another moment a few would decide to cut across walkways.
Many of them did not survive their migration to the other side of the road. Not because they were caught by birds, but because they became squashed caterpillas. They don't look very delicious. And their brightly colored body may suggest that they are poisonous.
Since caterpillas cannot be taught how not to wander into human pathways, at least people can be reminded to watch out out for them.
So, I created this road sign and posted a few outside my office. =) All done in between breaks of course...