The latest version of our behavioral tracking software, LoliTrack (version 4.2.1), adds new features and improvements, including:

• Inter individual distance (IID) for up to three individuals, e.g., for pair-wise tracking used in sexual behavior or aggression research, or for tracking distances between multiple body markers.
• Resize and move user-defined zones or arenas using the arrow keys for effortless fine adjustments.
• Dimensions of user-defined zones or arenas are now shown (in pixels).
• Center position of zones or arenas is now shown (via View menu).

We encourage all LoliTrack users to download this new and free updated version, and hope that your research will benefit from these added features.