 Animals that are most active at dawn and dusk , when temperatures are cooler than mid @-@ day , are called crepuscular . The subdued morning and evening light helps make them less visible to predators , but is bright enough to allow them to locate food . Some animals are crepuscular mainly because their prey is . <unk> animals in the area include mule deer , coyotes , porcupines , mountain cottontails , jackrabbits , and many songbirds . 
