Large Milkweed Bugs (Oncopeltus fasciatus) are often observed by people looking for monarch eggs or caterpillars. Milkweed bugs have a fascinating story in themselves. I cover six facts for you to know including: 1.They are true bugs 2. they undergo incomplete metamorphosis and you can often see all the stages on one plant 3. All stages eat milkweed sap but the adults eat the milkweed seeds 4. They exhibit aposematic coloration 5. You can distinguish males from females and 6. Milkweed Bugs migrate! Great video and closeups.