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.
Sealing tile and grout is easy and done in less than 30 minutes. If you do it yourself, you can save money. There are many different types of grout sealers to choose from, including spray-on grout sealers, sealers that you put on with a brush, and sealers that go on like chalking.