(A) Comparison of magnetotaxis data reported by Vidal-Gadea et al., 2015 and Landler et al., 2018 obtained by measuring their plots. Figure 3B and F, and Figure 3B, Figure 3—figure supplement 1 were reproduced from Landler et al., 2018; published under the terms of the Creative Commons Attribution license (http://creativecommons.org/licenses/by/4.0/)). Because Landler et al. omitted no-magnet control data, we used no-magnet control data from Vidal-Gadea et al., 2015. We found that Landler et al., 2018 worms fed OP50 bacteria (or OP50 plus 1% magnetite) show no significant orientation versus no-magnet control worms. (B) Under the hypothesis that Landler et al might have combined fed and starved worms because their assays were run for twice as long, we used the absolute value of the magnetotaxis index to reveal evidence that worms display a biased migration in the presence of a magnetic field (irrespective of the towards or away sign of their migration). We found that both magnet treatments in Landler et al., 2018 resulted in significantly biased migration when compared with no-magnet controls. (C) We also analyzed burrowing data from Landler et al., 2018 and used our horizontal controls because they were omitted in Landler et al., 2018. We demonstrate that combining data from fed and starved worm abolished significant burrowing indexes that were otherwise observed from each of these populations. Similarly, comparison of Landler et al., 2018 burrowing indices to our horizontal controls (N = 24) revealed no burrowing bias in their field up results for either fed or starved conditions. (D) However, when we compared the absolute value of burrowing bias we found that our combined fed + starved group, as well as Landler et al.’s ‘fed’ worms now showed significant bias when compared to horizontal controls. All tests based on Mann-Whitney Ranked Sum Tests.