Bugaboo is not a Nuna brand. Bugaboo is a separate brand that specializes in strollers and other baby gear. Nuna is another brand that also produces baby gear, including strollers, car seats, and travel systems. While both Bugaboo and Nuna make products for infants and young children, they are separate companies with their own distinct product lines and branding.
Nuna does however manufacture Bugaboo's infant car seat, the Turtle. The infant car seat is made by Nuna but sold under the Bugaboo brand.