Saguaros keep on giving. After the cactus is done blooming, the fruit starts to look like tiny watermelons. Then the fruit splits open into flower or heart shapes depending on how you look at them.
Sometimes the entrance to a bird nest in a saguaro appears heart shaped.
Here's a random heart on a decaying saguaro boot. A saguaro boot is the
woody plant tissue of the saguaro nest cavity which remains long after
the cactus dies.
It's hard to see, but after I uploaded the picture, I saw a tiny heart above the heart shaped cutout on the edge of the boot.
It's fun to discover random hearts! See more hearts at Clytie's Random Hearts.