The smartest insect is the honeybee.
Honey bees are considered the smartest insect, and there are several reasons that justify their place at the top.
First, honey bees have an impressive eusocial (socially cooperative) community.
Insects certainly display complex and apparently intelligent behavior.
They navigate over long distances, find food, avoid predators, communicate, display courtship, care for their young, and so on.
The complexity of their behavioral repertoire is comparable to any mammal.
Insects do have a memory as insects also have a brain and they have a pretty memory as well.
Insects are smart and have a considerable ability to memorize.
There is a strong correlation between mushroom body size and memory in many insects as well as between the size of the mushroom bodies and behavioral complexity.
You can drown some bugs.
However not all bugs will drown when you try to drown them.
Also in reality most bugs actually suffocate rather than actually drown when they die of a drowning.
Not all insects drown in water.
In fact, quite a few live there for at least part of their lives.
Insects breathe through holes in the sides of their bodies.
If they can't get air in through the holes, they will suffocate.
And most insects can survive under water (or in saturated soils) for short duration's.
In some ways, insects breathe like us and in other ways, insects breathe in a completely different way.
If humans don't receive oxygen, they can die within a few minutes, but almost all insects can survive without oxygen for many hours.
Insects have tiny brains inside their heads.
They also have little brains known as “ganglia” spread out across their bodies.
The insects can see, smell, and sense things quicker than us.
Their brains help them feed and sense danger faster, which makes them incredibly hard to kill sometimes.