Tool use in orangutans was observed by primatologist Birutė Galdikas in ex-captive populations. Orangutans in Suaq Balimbing were recorded to develop a tool kit for use in foraging which consisted of both insect-extraction sticks for use in the hollows of trees and seed-extraction sticks for harvesting seeds from hard-husked fruit. The orangutans adjusted their tools according to the task at hand, and preference was given to oral tool use. This preference was also found in an experimental study of captive orangutans. Orangutans have been observed to jab at catfish with sticks, so that the panicked prey would flop out of ponds and into the ape's waiting hands. Orangutan have also been documented to save tools for future use. When building a nest, orangutans appear to have some technical knowledge of construction and choose branches they know can support their body weight.