An unlikely example of convergent evolution at work

It is convergent evolution.
You are thinking about convergence of morphological features.
The bat and the bird evolved different bone structures to form a wing. In this case, both (immature) insects and arachnids have the ability to spin silk. Silk has multiple uses, but arachnids commonly use it for trapping and securing prey, whereas insect larvae do not - they use it for spinning a proptective coccoon and sometimes for dispersal. So when we find a caterpillar using silk to trap and secure prey, we are inclined to suspect that this particular use of silk has evolved 'de novo' in that particular lineage becuase it is unique in that lineage. It is a convergence of behavior and silk application made possible by the inherent properties of arthropod silk.Sorry about the mosquitoes - I just spent a week on the coast up there and had great weather.

Behaviors are certainly inheritable. Look at very young infant humans, before they have had time to or ability to adapt to their bevaviorial environment. They almost all have different personalities right from birth. Some cry a lot, some cry very little. Some smile and laugh more than others. Some frighten easier than others. The list of differences goes on and on.

Yeah, and they poop nonstop.

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