The file contains velocity vector fields of the wakes of two bat species (Glossophaga soricina and Plecotus auritus) flying at various speeds in a wind tunnel. The data is in .dat format, organized in columns with spatial (x,y,z) coordinates followed by velocities (vx, vy, vz) in each of the dimensions. The coordinate system is right handed with z in the flow direction of the wind tunnel and y vertically upwards. Accompanying xls files associate each sequence with individual, flight speed and number of wing beats.