Fruit of silverleaf nighshade (Solanum elaeagnifolium).

Cicada killer wasp (genus Sphecius) on soapberry leaves.

Fruits of desert Christmas cactus (Cylindropuntia leptocaulis).

Verde River in Clarkdale, Arizona.

Juvenile assasin bug (possibly the genus Arilus) on the trunk of Pinus ponderosa.
Some species of assasin bugs coat their bodies with resin to ward off predators.