Sylvia is willing to talk about her Alzheimer's diagnosis, even though she struggles to form sentences and find the right words.

The heat of a scorched riverbed is too much for some animals, but the rare and venomous Gila monster is still active and hunting for prey. Meanwhile, the untiring hummingbird mother will feed her remaining chick until it finally fledges.

Sylvia talks about how her diagnosis was reached and about what limitations there are for her now, such as going out for walks by herself and singing in the choir at church.

May sees drought conditions in the park, but the saguaro cactus is completely unaffected. A family of ground squirrels is laying low, but a long-nosed snake has caught their scent.

The two sisters unpack a box that hadn't been opened since she moved to the house in Tacoma. It contains artwork she had done in the past along with some stray art supplies.

The saguaro cactus blooms overnight and its flower is visited the next morning by a Gila woodpecker. As the heat of day rises, harvester ants work go about their work, wary of a mortal enemy in the park.

The two sisters talk about coloring, one of Sylvia's favorite things to do and they look at some of the work she has done.

In June, surviving the ferocious sun and intense heat is a challenge for every living being in the park, and each has developed a special technique to see it through until the next rain.

After the rain, the opuntia cactus, or “prickly pear,” ripens to provide a sweet but not easily accessible meal for animals such as the ground squirrel. As the water seeps in, the park enjoys a moment of relaxation.

Sigrid and her sister Sylvia hang out in the kitchen talking about coffee and making some, too. At times, they get a bit silly.

A giant scorpion is on the prowl looking for food, and a family of grasshopper mice seems to be on his menu tonight. However, the fortitude of the desert's denizens should never be underestimated.

Sigrid and Sylvia continue to work on making coffee. Meanwhile, they talk about what time of day they like to drink it and what they put in it.

A horned lizard out hunting for ants catches the eye of a hungry coachwhip snake, and deploys an impressive variety of strategies in order to not be eaten alive.

A thunderstorm hits with the power of a tropical monsoon, putting the desert creatures at risk from the powerful floodwaters.

After the rains, there is enough water and food for all to share in the desert and Saguaro National Park can bask in all its glory.