[4] At the time of the cat drop in 1960, newspaper reports indicate that a district in Sarawak was suffering from an infestation of rats, which were destroying crops.
Deaths of cats may have been caused by direct exposure to DDT sprayed in dwellings, as opposed to biomagnification.
[4] The native domestic cat population being reduced as an unintended consequence of the World Health Organization (WHO) spraying DDT for malaria control has been referenced as an example of the problems and solutions that may arise from human interventions in the environment, or of how unintended consequences lead to other events more generally, and particularly how frameworks such as systems thinking[7] or "whole systems thinking" can more effectively forecast and avoid negative consequences.
Video footage purporting to show an aerial beaver drop, intended to improve water quality, appeared in October 2015.
[9] The Utah Division of Wildlife Resources restocks its "high-elevation lakes and streams with tiny trout" dropped directly (no parachute) from an aircraft flying 100–150 feet above the water.