Opportunistic feeders, their diet varies from one region to another. In the Antarctic, killer whales eat about 67% fishes, 27% marine mammals, and 6% squids. Killer whales in the Bering Sea (near Alaska) eat about 65% fishes, 20% squids, and 15% marine mammals.
Even though your shower grout looks dry, using it too early or sealing it before it's ready may damage it, leading to premature failure. Most cement-based grouts require a cure time of 48 to 72 hours before applying a penetrating sealer.
After sealing, wait a minimum of 24 hours before using the shower; some products may recommend three days instead. Other grout formulas may require a shorter or longer drying time, and epoxy-based grouts may allow you to skip the sealer, thus the wait time before using your shower or bathtub.