https://phys.org/news/2018-07-diamond-doves-optimize-movements-flexible.html

Contrary to their hypothesis, diamond doves do not control takeoff and landing on flexible perches as effectively as they do on stiff perches. Collectively, the findings suggest that diamond doves use generalized takeoff and landing behaviors regardless of perch flexibility. For example, they do not coordinate hindlimbs with forelimbs or modify leg function to adjust for perch flexibility, they do not leverage elastic energy during takeoff, landing velocities remain unchanged, and long periods of destabilization are required during landing on flexible perches. Moreover, when the authors observed doves in their natural habitat they were frequently seen on larger-diameter perches, which tend to be stiffer, so might preferentially seek these out. According to the authors, the findings suggest that the flexibility of perches remains a challenge for flying birds.

Crandell adds: "As it turns out, birds are not always very graceful when they land and take-off. When branches are too flexible, birds end up performing poorly—losing energy to the perch during take-off, and struggling with stability when landing."

                                                            
                                    
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