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Archive for September 27, 2011

Small Milkweed Bugs

This time of year you can often find many orange and black bugs on milkweed leaves.  If they are black with an orange “X” on their forewings, they are small milkweed bugs (Lygaeus kalmii).  This combination of colors, which many insects that feed on milkweed have, warns predators that, due to ingesting milkweed toxins, red and orange insects may be bad for their health.  Adult small milkweed bugs feed mainly on milkweed seeds, but they also consume the nectar of a variety of flowers.  In addition, they occasionally prey on insects, such as the ant in the accompanying photograph.