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.
Allow new grout to cure for 48 to 72 hours before sealing. Existing grout should be cleaned and dried before resealing. Make sure grout lines aren't cracked, chipped, or otherwise compromised before treating with a sealant. If they are, touch up grout and wait the requisite 48 to 72 hours before sealing.