The most vulnerable targets tend to be ladybugs that can't move or have a soft exoskeleton because of the growth stage they are in.
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Related: ladybug
Prev: There's also a benefit in eating others that have eaten better food, as the superior nutrition gets passed on to the murderous ladybug.
Next: One study found that ladybugs that eat other ladybugs have higher chances of survival and develop more quickly.