4. Ant
Ants have colonised almost every landmass on Earth. Their success in so many environments has been attributed to their social organisation and their ability to modify habitats, tap resources and defend themselves. Hence, ant control can be very tricky.
Ants can enter through even the thiniest cracks on walls in search for food. Once food has been located, they are able to unite their entire colony to carry back to their nest. To make things worst, their nest locations can be anywhere. And to top it off, each colony size can number up to 300,000 and above. Though ants do not carry disease, but some species does inflict painful bites when comes in contact or threatened.
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