MONARCH BUTTERFLY IN CATERPILLAR STAGE, TOMMY THOMPSON PARK, LESLIE ST. SPIT, TORONTO, ON

   These Monarch caterpillars are on the leaves of  Milkweed plants.   Monarchs cannot survive without Milkweed; their caterpillars only eat Milkweed.  Thus, the Monarchs need to lay their eggs on Milkweed.  Monarchs are threatened due to the decline in Milkweed.  So if you have a garden, plant some Milkweed.