Home Sweet Home
Some species of bees lay their eggs among aphids to provide food for their newly hatched larvae, so they are looking for leaves covered in dark hairy spots. Other bees look for a dark hole or den to deposit their eggs. Seeking a good place to leave her young, the bee lands on the orchid, gets trapped inside the labellum, and carries pollen with her when she escapes.
This Cypripedium macranthos has a dark labellum, tricking the female Bombus bee into thinking she has found a good den in which to lay her eggs.