‘Just that weird’: Suckerfish observed swimming in manta rays’ rear ends, could impede pooping, sex
Researchers have observed remoras, also known as suckerfish, engaging in a behavior called cloacal diving by swimming into the rear ends of manta rays. This unusual interaction raises questions about whether the remoras are seeking food or shelter, and it could potentially harm the manta rays' reproductive and excretory functions. The study highlights the complex and often parasitic nature of the relationship between these species.
- ▪Remoras have been seen diving into the cloacas of manta rays, a behavior termed cloacal diving.
- ▪This is the first documented instance of remoras infiltrating manta rays' rear ends, although similar behavior has been noted with whale sharks.
- ▪Researchers believe this behavior could negatively impact the manta rays' cloacal function over time.
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Wildlife ‘Just that weird’: Suckerfish observed swimming in manta rays’ rear ends, could impede pooping, sex By Ben Cost Published May 16, 2026, 10:46 a.m. ET Remoras have been observed diving into manta rays' backsides, although researchers can decided if they're seeking food or shelter. ullstein bild via Getty Images They’re sticking it where the sun-ray don’t shine. While remoras are known to be rather clingy, some are getting too close for comfort by diving into manta rays’ backsides, per a scientific probe in the journal Ecology and Evolution.
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