How can walruses see underwater?

Walruses have adapted to see underwater by having a specialized eye structure that allows them to focus in aquatic environments. Their eyes contain a large amount of the protein rhodopsin, which enhances their ability to detect light in murky waters. Additionally, walruses can close their nostrils to hold their breath while diving, which helps them maintain clear vision as they hunt for food. This combination of adaptations enables them to navigate and hunt effectively underwater.