Going Steady: 10 Animals More Monogamous Than Us

Mairi Beautyman
Science / Natural Sciences
February 10, 2010

But I also came across a human parasitic worm, Schistosoma mansoni that is also monogamous.

According to Wikipedia, "The adult female worm resides within the adult male worm's gynaecophoric canal, which is a modification of the ventral surface of the male forming a groove."

This method of shacking up seems to work for them, as each female lays approximately 300 eggs a day (one egg every 4.8 minutes), which helps make it one of the most widespread of the human-infecting schistosomes. No talks about needing "space" here -- there's no where to go.

For more stomach-churning parasites, check out 9 Human Parasites You Don't Want Along for the Ride.