Nudibranchs are tiny sea slugs that can be found all over the world. They have two "horn-like" nostrils known as rhinophores, which follow scents underwater in order to find food and other nudibranchs. Their bright colors are a warning to predators, advertising the toxins that they produce. If a nudibranch is having trouble finding a mate, it can freely change from a biological male to a biological female, and vice versa. Nudibranchs are tiny sea slugs that can be found all over the world. They have two "horn-like" nostrils known as rhinophores, which follow scents underwater in order to find food and other nudibranchs. Their bright colors are a warning to predators, advertising the toxins that they produce. If a nudibranch is having trouble finding a mate, it can freely change from a biological male to a biological female, and vice versa.