Coffee Plant Leaves (image) Aarhus University Share Print E-Mail Caption The leaves of the coffee plant are full of small dark fecal droppings -- ant waste containing urea and amino acids that the plants can absorb and exploit for growth. Credit Photo: Joachim Offenberg. Usage Restrictions May be used in relation to this news release. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.