Archaeopteryx multi-hop take-off before flapping (free pdf)
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Ben Creisler
Aug 5, 2026, 1:28:27 PM (15 hours ago) Aug 5
to DinosaurMa...@googlegroups.com
Ben Creisler
A new paper:
Free pdf:
E.A. Meilak, N.J. Gostling, C. Palmer, P. Provini & M.O. Heller (2026)
Hop, hop and away: On the take-off of Archaeopteryx using a multiple leaping mechanism
Developmental Biology (advance online publication)
doi: https://doi.org/10.1016/j.ydbio.2026.07.018
https://www.sciencedirect.com/science/article/pii/S0012160626001648
Highlights:
In the most basic bird, Archaeopteryx, long legs allowed for powerful hops or leaps.
Three bipedal leaps without wing assistance (leap, leap, leap, with subsequent flapping), or two bipedal hops with minimal wing assistance (leap, flap leap, with subsequent flapping) would have generated sufficient velocity for a take-off from the ground and sustained flight.
A multi-hop take-off, used by modern birds when not stressed, may have been the forerunner for their explosive single-hop take-off.
Abstract:
Archaeopteryx, the iconic 150-million-year-old basal bird, lies at the heart of the debate on the origin of avian flight. While its asymmetric wing feathers indicate some flight capability, its limited shoulder mobility and reduced feather asymmetry suggest it lacked the capacity for the single, powerful leap used by modern birds for rapid take-off. Observations of extant birds reveal that many species, including corvids, employ multiple bipedal leaps with minimal wing assistance to gradually accelerate during take-off, particularly in low-stress contexts. Given Archaeopteryx’s robust hindlimbs, we hypothesized that it could have used a similar multi-leap strategy to become airborne. We therefore tested the hypothesis that Archaeopteryx could generate sufficient take-off velocity via multiple hops or leaps. To test this, we developed a biomechanical model based on experimental take-off data from living birds, adapted to Archaeopteryx’s anatomy. By analysing joint moments at the hip, knee, and ankle, alongside muscle capacity, we estimated its take-off velocity. Our results demonstrate that Archaeopteryx could have achieved its minimum sustainable flight speed in as few as two to three leaps, without requiring the energetically demanding single leap of modern birds. This study provides the first quantitative support for a ground-up, multi-leap take-off mechanism in early birds, distinct from the single-leap strategy usually observed today. We propose that the modern avian take-off may have evolved from this primitive multi-leap behaviour, offering new insights into the biomechanical transition from terrestrial locomotion to powered flight.
E.A. Meilak, N.J. Gostling, C. Palmer, P. Provini & M.O. Heller (2026)
Hop, hop and away: On the take-off of Archaeopteryx using a multiple leaping mechanism
Developmental Biology (advance online publication)
doi: https://doi.org/10.1016/j.ydbio.2026.07.018
https://www.sciencedirect.com/science/article/pii/S0012160626001648
Highlights:
In the most basic bird, Archaeopteryx, long legs allowed for powerful hops or leaps.
Three bipedal leaps without wing assistance (leap, leap, leap, with subsequent flapping), or two bipedal hops with minimal wing assistance (leap, flap leap, with subsequent flapping) would have generated sufficient velocity for a take-off from the ground and sustained flight.
A multi-hop take-off, used by modern birds when not stressed, may have been the forerunner for their explosive single-hop take-off.
Abstract:
Archaeopteryx, the iconic 150-million-year-old basal bird, lies at the heart of the debate on the origin of avian flight. While its asymmetric wing feathers indicate some flight capability, its limited shoulder mobility and reduced feather asymmetry suggest it lacked the capacity for the single, powerful leap used by modern birds for rapid take-off. Observations of extant birds reveal that many species, including corvids, employ multiple bipedal leaps with minimal wing assistance to gradually accelerate during take-off, particularly in low-stress contexts. Given Archaeopteryx’s robust hindlimbs, we hypothesized that it could have used a similar multi-leap strategy to become airborne. We therefore tested the hypothesis that Archaeopteryx could generate sufficient take-off velocity via multiple hops or leaps. To test this, we developed a biomechanical model based on experimental take-off data from living birds, adapted to Archaeopteryx’s anatomy. By analysing joint moments at the hip, knee, and ankle, alongside muscle capacity, we estimated its take-off velocity. Our results demonstrate that Archaeopteryx could have achieved its minimum sustainable flight speed in as few as two to three leaps, without requiring the energetically demanding single leap of modern birds. This study provides the first quantitative support for a ground-up, multi-leap take-off mechanism in early birds, distinct from the single-leap strategy usually observed today. We propose that the modern avian take-off may have evolved from this primitive multi-leap behaviour, offering new insights into the biomechanical transition from terrestrial locomotion to powered flight.
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