Video Metadata Title: Stereographic High-Speed Videos of Insect Light Entrapment Authors: Samuel T. Fabian, Yash Sondhi, Jamie Theobald Description: We made field recordings at Estación Biológica Monteverde (EBM) and CIEE, Monteverde Field Station, Costa Rica, under permit numbers M-P-SINAC-PNI-ACAT-024-2020 and R-SINAC-ACG-PI-016-2022 issued by SINAC (National System of Conservation Areas). Data was collected on two separate field trips (Jan-Feb 2022 and May 2023). We used a pair of monochrome, shutter-synchronized Fastec TS3 high-speed cameras mounted on a single tripod cross-arm. Most videos were shot at 500 fps, providing good temporal resolution for flight behavior. These cameras allowed us to film with infrared illumination, which we assumed was invisible to the insect eyes. Consistent with this assumption, we did not observe any insects crashing into or interacting with our IR lights (Larsen Wide Angle IR Illuminators; 850nm). We configured the IR lighting to create high contrast for flying insects against the dark night background. While the exact camera orientations and distances from the light-source varied from night to night, we invariably centered the light source in the field of view of both cameras. In practice, this gave us a maximal recording volume of 1.5 m x 2 m x 1.5 m (Width x Depth x Height, with height aligning with gravity). To provide stereo calibration, we waved a known-sized checkerboard through the overlapping views of both cameras. We could then use the inbuilt MATLAB Camera Calibration App (Computer Vision Toolbox 10.3) to both detect the checkerboards in the views of both cameras and estimate both the intrinsic (optical center, focal length, and radial distortion) and extrinsic camera parameters (relative camera orientation and translation). Within our field recordings, we were unable to identify many insects below order-level with certainty. We filmed the lights in several different configurations. ‘No Light’: The cameras were pointed at a region of space in the forest without any illumination from UV or visible bulbs or tubes. IR illumination was still provided, and minimal leakage in the red was present. ‘UV Tube’: The UV tube light was suspended vertically from rope between two trees, approximately 1.5 m from the ground. Macro UV Tube is the same treatment, but to observe insects, the cameras were moved closer for a few trials; for the purpose of data analysis, both treatments have been combined. ‘UV Bulb Up’: The UV LED bulb mentioned above was affixed to a tripod, approximately 1 m from the ground, pointing upwards. ‘UV Bulb Down’: The same UV LED bulb was suspended approximately 1.5 m from the ground. ‘White Sheet Above’: A white cotton sheet was suspended approximately 2.5 m above the ground. The UV tube was pointed upwards close to the light, using extra shielding at its base to prevent non-diffuse downwelling light. ‘Sheet Down’: The white cotton sheet was spread on the forest floor, and the UV tube was kept close to the ground, facing downwards, approximately 0.3 m from the ground. To get a better overview of the different insects coming to light and to increase the sampling of species, we repeated light attraction experiments with an additional round of fieldwork in 2023, using a known set of 30 insect species, spanning 6 orders, with a single light condition (UV Bulb Down). Insects were photographed to confirm their identity and then were released and filmed with the stereo setup described above. We qualitatively surveyed the videos, noting the different motifs observed (presence-absence) and the taxon present in the video (identified to different taxonomic levels). ‘Orbit’: Animals traveling in an arcing pattern around the light (even if the loops were not complete) were classified as showing orbiting behavior. From reconstructed trajectories, looping behavior was easily identifiable from the circular or oval paths when viewed from above. ‘Stall’: Animals flying upward and slowing down while pitching upward but not completely inverting were classified as showing stalling behavior. ‘Invert’: Animals tilting their dorsum fully downward for any portion of the flight were counted as inverting. In several videos, multiple motifs were present at different parts of the flight and in different species, making it hard to quantify; thus, we included any of the motifs seen across all animals in the video. The final classification is somewhat subjective, but we provide the original videos in the final repository for future cross-verification. We also repeat this for the digitized tracks, where the motifs are identified for only the tracked insects in each track. The metadata files have the names for the file list in each compressed folder. Keywords and Categories: Moth, 3D Trajectories, Insects, Flight, Light, Phototaxis License: CC-BY