These bugs have slowly developed the colour of their shells to red and black. The scientific reason behind this is that tiny predators, like small birds try to keep away from food, especially if it is coloured, black, or vibrant red. This technique is called aposematia, where colour is used as a signal to the toxic contents.
A ladybug beats its wings about 5100 times a minute or about 85 beats a second when it flies.
The spots at the back of the shells of ladybugs are just for display and do not serve any purpose apart from scaring off the predators.
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