In the same set of observations as those mentioned above the minimum number of thrusts was also noted - and turned out to be eight. I rather suspect that human records would be more impressive, with possibly several hundred thrusts before climax in certain instances and only one or two in others. But in fairness it must be admitted that the performance of the various primates has hardly been examined in any detail in this respect. There may well be sturdier howler monkeys than the ones observed!