The menstrual cycle of the spider monkey (Ateles geoffroyi) (1998)

Hernandes-Lopez, L., Mayagoitia, L., Esquivel-Lacroix, C. et al.

Abstract

The [10] spider monkeys live in a large outdoor cage. Four of the five females were trained to enter a small cage attached to the door of their enclosure and to allow a cotton swab to be introduced in the vagina. For cooperation, the animals were rewarded with a piece of mango or a small candy. This procedure was slightly modified [not described], and the animals were trained to be injected with ketamine for subsequent blood collection.