Blue sharks use their countershading camouflage to sneak up on their prey—which fortunately doesn't include Bertie Gregory 🦈 Dolphins Up Close with Bertie Gregory is now streaming on Disney+ and Hulu. ➡ Subscribe: http://bit.ly/NatGeoWILDSubscribe And check out more National Geographic series and specials here: ➡ Disney Plus: https://on.natgeo.com/3q6on5p ➡ Hulu: https://on.natgeo.com/3Qor0Ko ➡ NGTV app https://www.nationalgeographic.com/tv/ ➡ ABC app https://abc.com/ #NatGeoAnimals #DolphinsUpClose #BertieGregory About Nat Geo Wild: National Geographic Wild is a place for all things animals and for animal-lovers alike. Take a journey through the animal kingdom with us and discover things you never knew before, or rediscover your favorite animals! Get More Nat Geo Wild: Official Site: http://bit.ly/NatGeoWILD Facebook: http://bit.ly/NGWFacebook Twitter: http://bit.ly/NGWTwitter Instagram: http://bit.ly/NGWInstagram Blue sharks are masters of camouflage 🦈 #DolphinsUpClose https://youtube.com/shorts/tIJGgJqtbP0 Nat Geo Wild https://www.youtube.com/user/NatGeoWild