Comparison of MR-LF and other small-scale, flexible magnetic robots that exhibit ground-based locomotion (e.g., crawling, rolling). The table shows that MR-LF has the largest internal compartment volume and the second largest compartment-to-volume percentage. The flexibility is classified as “distributed” if the bending occurred throughout the body length, “localized” if the bending was localized to small segments within the body, and “origami” if the motion was from folded origami-like structures. In rows 14 and 15, the flexibility is classified as “other” because the bending motion was distributed, but the body geometry also included segments to support the robot and control its bending direction. Abbreviations are as follows. P: Permanent magnet, M-EC: Magnetic-elastomer composite, D: Nonuniform field (e.g., dipole), U: Uniform field, S: Semi-uniform field, Y: Yes, N: No, NR: Not reported, L: Localized flexibility, D: Distributed flexibility, O: Origami-like flexibility, *: Values were estimated based on available information.