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Belfium
endothermic animals are able to generate their own warmth, however ectothermic animals can not. 
On a hot summers day, endothermic animals will not need to rely on the sun's heat as they can regulate their body temperature on their own.
Ectothermic animals will most likely respond to this environmental change by sitting out in the sun to absorb the sun's warmth - as they dependant on this heat. 
Maddy7806

Endotherms are able to maintain a constant body temperature. An endotherm may respond to a hot summer day by sweating or panting. The body temperature of an ectotherm, on the other hand, changes with its surroundings. In order to stay cool, an ectotherm must move somewhere cooler like the shade of a plant or rock or seek cool water to lay in.