Final answer:
Rats camouflage the entrance to their burrow by creating a 3-dimensional network of cylindrical burrows and individual, vertical, teardrop-shaped burrows.
Step-by-step explanation:
The rats camouflage the entrance to their burrow by creating a 3-dimensional network of cylindrical burrows and individual, vertical, teardrop-shaped burrows. By constructing their burrows in this way, the rats are able to effectively hide the entrance and make it difficult for predators to locate. This camouflage technique helps the rats protect their shelter and food supplies from potential threats.