Bioinspired design connects biology and engineering, allowing us to gain insights about a particular species while also improving structural design. Birds, for example, have provided inspiration to aircraft designers for centuries; even those that appear in the average backyard can be used as inspiration. Some birds are specialists: seagulls, for example, rely mainly on gliding flight. In contrast, birds of prey are flight generalists capable of agile and efficient flight. They perform frequent take-offs and landings, carry significant payloads, fly near solid and free surfaces, and can hover for extended periods of time. These abilities are highly sought after in small-scale, uncrewed aerial vehicles (sUAVs) which have limited battery capacity and are typically only designed to perform one of the aforementioned tasks. Birds of prey can perform both efficient and agile flight in variable environments due to their wing morphology. Their emarginated primary feathers distinguish them from other specialist birds and have been hypothesized to positively tailor the flowfield around the wings. In this work, we experimentally evaluate a biologically relevant wingtip design, investigating the aerodynamic effects of the wingtip slots. Wind tunnel and Particle Image Velocimetry (PIV) experiments are conducted to understand how the wingtip devices alter the forces and flowfields. We find that these slotted wingtips expand the flight envelope, providing insights into why birds have them and how they can be used to improve aircraft design.