To make an orthograde single-footed leap, which was the most common way to jump, the gibbon continued its walk taking one full stride before reaching the take off phase.

BBC: Earth News - How gibbons leap huge distances revealed by scientists

Of this most recent spate of accidents, where many aboard have been able to walk away from the wreckage, it is worth noting that they occurred mostly in the landing phase, at relatively low altitude and speed and with the aircraft in question carrying only limited amounts of fuel.

BBC: Making plane crashes less deadly