Slide Images: Two photographs of a large number of Brazilian free-tailed bats flying over south-central Texas.
The left photo shows the bats emerging from a cave at sunset silhouetted against the sky. The photo on the right shows the nightly dispersal column, showing individually-identified bats using computer vision algorithm. The bats appear to glow in the dark sky.

Credit: Thomas Kunz and Margrit Betke, Boston University