@natgeofamily: Oceanic manta rays are huge, but despite their size, no one knows where they go with their rare and infrequent pregnancies. This ultrasound—performed by marine biologist Dr. Madalena Pereira Cabral and filmed by @Alonso I Rodriguez de la Parra —is helping unravel the mystery, allowing marine biologists to track expectant mothers, better understand the vulnerable species' slow reproductive cycle, and learn how to better protect them. Learn more about this incredible moment at the 🔗 in bio.