Data supplements
JEB01986 Supplementary Material
Files in this Data Supplement:
- Movie 1
-
Movie 1: Guinea fowl running across level runway. Body center of mass (COM) energy is shown below, synchronized to video. Total kinetic energy (EK, green) and gravitational potential energy (EGP, blue), are summed to obtain the total mechanical energy of the body (Etot, yellow).
- Movie 2
-
Movie 2: Guinea fowl encountering an unexpected drop in substrate (U treatment), exhibiting the �EKh mode� response. This movie illustrates the most common response to the perturbation (EKh mode, 9 of 19 trials). Body COM energy is shown as in Movie 1.
- Movie 3
-
Movie 3: Guinea fowl encountering an unexpected drop in substrate (U treatment), exhibiting the �Ecom mode� response. This movie illustrates the second most common response to the perturbation (Ecom mode, 7 of 19 trials). Body COM energy is shown as in Movie 1. Note that there is a much smaller increase in total kinetic energy (EK, green), than in the �EKh mode� response shown in Movie 2.
- Movie 4
-
Movie 4: Guinea fowl encountering an unexpected drop in substrate (U treatment), exhibiting the �EKv mode� response. This response was only observed in three trials by the smallest bird. Body C)M energy is shown as in Movie 1.
- Movie 5
-
Movie 5: Guinea fowl negotiating a visible substrate drop (V treatment). Body COM energy is shown as in Movie 1. The behavior during V trials was more variable during U trials. This video shows a common case, in which the bird slowed much more than U trials and stumbled slightly with a re-stepping response during the step back up to the original height.
- Movie 1
-