Footprint of brontozoum giganteum Small 217×320 Medium 434×640 Large 694×1024 Download Tiff Original 1627×2400 | (3.1 MB) Description A footprint of brontozoum giganeum, a now extinct relative of the cassowary. This example is eighteen inches in length, the bird was believed to weigh between four and eight hundred pounds. Keywords avian, bird, brontozoum, foot, footprint, fossil, giant, giganteum, impression, Natatores Galleries Bird Anatomy Source: S. G. Goodrich Animal Kingdom Illustrated Vol 2 (New York, NY: Derby & Jackson, 1859)