"The name cardinal beetle typcially refers to three three different species of beetle.
The Red-headed or 'Common' Cardinal beetle (Pyrochroa serraticornis) is a red to orange beetle with, as the name suggests, a red head. It is approximately 20mm long and found throughout Britain.
Cardinal beetles prey on other insects and are normally found on flowers at the edges of woodland. Their bright red colour protects them from predators which believe it to be toxic.
People often mistake the smaller scarlet lily beetle, Lilioceris lilii, for a cardinal beetle as they also have a black underside and wings that are spotless and red. However, the scarlet lily leaf beetle's wing cases have tiny dimples and are shinier and more rounded than the dull, narrow, flattened and elongated cardinal beetle. The beetles can also be distinguished by the cardinal's toothed antennae. Another difference between the two is their diets: Scarlet lily leaf beetles are herbivores and are usually found eating lily leaves, whereas cardinal beetles are usually found on tree bark and flowers and feed on flying insects." wiki
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