Try contacting Education Departments of zoos or aquaria where they are kept, such as SeaWorld in the US. They should be able to describe in detail and maybe even provide you with a sample, if you need it.
Sirenian dung - There are varying shades of green to brown, depending on what they have been feeding on. The boluses are narrow (about 2-4cm in diameter) and often long (10-40cm in length). They tend to float in seawater, but sink in freshwater. It is made up of undigested vegetative contents (fibrous) and consists of entirely seagrass in the case of the marine adapted dugong, and a mixture of seagrass and aquatic vegetation in the manatee, to completely aquatic and opportunistic terrestrial (overhanging) vegetation in the case of the riverine Amazonian manatee. All sirenians (manatees and the dugong) are generalist herbivores, so they adapt to the local vegetation in the surrounding habitat. In areas where there are manatees you can often see dung in the water, and researchers harvest the dugong dung for genetic analyses along the coast at low tide where the samples are left exposed on the beach. The fecal materials can persist for a few days, but in some areas the bolus is broken up by fish and dissolves in the water. Manatees are also carpophagous.
Attached is a picture of a floating manatee fecal bolus.
It will depend on what they are feeding on. In Cuba, manatees mostly feed on sea-grasses and in my study area manatee fecal material are very easy to find. The form and color of the dung will depend of the time, fresh materials are more green, old ones are more brown and less compacted and of course reduced in size. I can send you pictures and even videos of how it looks like. Let me know.
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