Blue Whale VR is a free virtual reality app that provides a 360 tour of a blue whale's anatomy. The app isn't terribly interactive. The only interactive element is that students can move around the whale during the tour. If you don't have VR viewers, you can access the tour through this YouTube video.
The app could be a good to pair with this TED-Ed lesson titled Why Are Blue Whales So Enormous? The video that the lesson is based on uses some neat animations to explain how much blue whales eat, how the eat, and why they need to eat so much.