Look how this lovebird strips the leaves removing each midvein to tuck amongst its feathers for safe keeping... Rather than taking each piece home separately, this is a more efficient way of gathering and transporting nest building material. This trait is typical in Peach-faced lovebirds (Agapornis roseicollis) They hide bark and other nest-building material in their rump feathers for effective transportation: https://www.sciencedirect.com/topics/agricultural-and-biological-sciences/lovebird