Before sleeping, parrotfish envelop themselves in a transparent cocoon made of mucus.

Before sleeping, parrotfish envelop themselves in a transparent cocoon made of mucus. This remarkable “sleeping bubble” completely surrounds their body as they rest on coral reefs.The mucus cocoon serves two vital protective functions. It masks the fish’s scent, making it much harder for nocturnal predators like moray eels to find them. It also acts as a physical barrier against blood-sucking parasites, such as gnathiid isopods, that commonly attack sleeping fish.Thanks to this clever adaptation, parrotfish can sleep more safely and peacefully through the night, hidden from both predators and parasites.Did you know? 🎓