After spending 3 days searching for the ultimate cat on the "boat of pain" with the Mrs and 2 good friends, we failed our mission despite coming very close!
However, through work, I was lucky enough to return for a second attempt just 2 weeks later and after five and a half hours, I was in luck! This presumed female Jaguar was actually swimming across the river ahead of our boat and we watched the animal for 30 minutes on the river bank, before it slinked back into the river and away.....