It is generally not recommended to place a caterpillar breeding cup in direct sunlight, as the heat and light may harm the caterpillars or cause the food they are feeding on to spoil.
It is important to keep the breeding cup in a location with indirect light and at a moderate temperature in order to provide the best conditions for the caterpillars to thrive.
If the cup is placed in direct sunlight, it is important to monitor the temperature inside the cup and to provide shade if necessary to prevent the caterpillars from overheating.