Light blue caterpillar with orange/red lump found on side of the wall. (Toronto, ON)
Your photo is of Abbott’s sphinx moth caterpillar. The tail usually indicates it is in the Sphingidae family. Yours is in the middle stage of development because of the distinct coloration. These are found thru out eastern and central North America in woodland type areas.
Caterpillars feed on feed on grape, Vitis and Ampelopsis spp of plants. Moths feed on nectar.