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Some suggest mothballs as a deterrent for iguanas, but they are ineffective and harmful. Mothballs contain chemicals like naphthalene or paradichlorobenzene, which are toxic to humans and animals, including iguanas. The fumes can cause respiratory problems, skin irritation, and other health issues. Moreover, using mothballs outdoors is not recommended, as they contaminate soil and water sources.

Even if you have extreme ophidiophobia (fear of snakes), don’t try to shoot or kill them with a shovel. Besides being pretty cruel, killing snakes in most states is illegal unless your life is at risk and many species are protected. 

Plus, you're putting yourself at greater risk using these techniques if it goes wrong and the now-angry snake is venomous.

Squirrels hate anything that disturbs the peace in their nest. Loud noises, bright lights, and strong smells like cayenne pepper or mothballs will deter them from your attic. Spread these scents, add a strobe light, or use an ultrasonic repeller to keep squirrels from nesting in your attic.

Identifying the specific animal running on your roof at night can be challenging without direct observation. Common nocturnal roof visitors include raccoons, squirrels, opossums, and rats. Raccoons are bigger and can create heavy thumping sounds. Squirrels are agile and may produce rapid scurrying noises. Opossums tend to move stealthily with less noise. Rats can make scratching or gnawing sounds. To determine the culprit, look for signs like footprints, droppings, or damaged areas near the roof. For accurate identification, consult a pest control professional or set up wildlife cameras near potential entry points.