The female leaf-cutter bee with pollen she has collected.
These macro images by Alejandro Santillana are being showcased in the Insects Unlocked project at the University of Texas at Austin.
A female sweat bee.
A large female carpenter bee.
A male parallel leaf-cutter bee.
The honey-bellied sweat bee.
The male cuckoo-leaf-cutter bee.
The female long-horned bee.
The male two-spotted long-horned bee.
The male hostile leaf-cutter bee.