**FIGURE 1.** Image of a Long-Eared Owl TMT, showing the measurement landmarks. Abbreviations: ML, maximum shaft length between the longest proximal-distal ends of the TMT; MW, midshaft transverse width of the TMT; TMT, tarsometatarsus.

**FIGURE 2.** Plot of the lengths of La Brea *Athene cunicularia* TMTs through time. Open diamonds: individual specimens; solid squares: mean for each pit.

**FIGURE 3**. Plot of the lengths of La Brea *Asio otus* TMTs through time. Open diamonds: individual specimens; solid squares: mean for each pit.

**FIGURE 4**. Plot of the robustness (midshaft cross-sectional area divided by length) of *Athene cunicularia* TMTs through time. Open diamonds: individual specimens; solid squares: mean for each pit.

**FIGURE 5.** Plot of the robustness (midshaft cross-sectional area divided by length) of *Asio otus* TMTs through time. Open diamonds: individual specimens; solid squares: mean for each pit.

**FIGURE 6**. Time-series analysis of length (mm), width (mm), depth (mm), and robustness of tarsometarsi of *Asio otus* through the last 29 ka at RLB. As is apparent from the statistical analysis (Table 6), they exhibit either a unidirectional random walk or complete stasis.

**FIGURE 7.** Time-series analysis of length (mm), width (mm), depth (mm), and robustness of tarsometarsi of *Athene cunicularia* through the last 29 ka at RLB. As is apparent from the statistical analysis (Table 5), they exhibit either a unidirectional random walk or complete stasis.