Watch These Birds Use Their Tongues to Suck Up Nectar

Why It Matters

The discovery rewrites how scientists view avian feeding biomechanics and underscores multiple evolutionary pathways to exploit high‑energy floral resources, influencing pollination ecology and bio‑inspired design.

Key Takeaways

• Sunbirds use straw‑like tongue to suction nectar
• First vertebrates shown to feed via suction
• Hummingbirds rely on sponge‑like tongue, not suction
• Study used 3‑D printed flowers and high‑speed video
• Findings illustrate convergent evolution of nectar feeding

Pulse Analysis

The recent paper in *Current Biology* documents a previously unknown feeding strategy among sunbirds, a family of small African and Asian passerines. By extending a V‑shaped groove on their elongated tongues and sealing it against the bill, the birds create a vacuum that draws liquid nectar upward, essentially acting as a biological straw. Researchers led by Alejandro Rico‑Guevara and David Cuban captured the motion with high‑speed cameras and 3‑D printed flower replicas, providing the first visual proof that vertebrates can employ true suction to harvest floral rewards.

This mechanism stands in stark contrast to the well‑studied hummingbird tongue, which functions like a compressible sponge that absorbs and wrings out nectar. The divergent solutions underscore a classic case of convergent evolution: unrelated lineages occupying the same ecological niche evolve similar external traits—such as long bills and bright plumage—while retaining distinct internal biomechanics. The discovery reshapes our understanding of avian pollinator diversity and suggests that the evolutionary pressure to efficiently extract high‑energy nectar can drive multiple, unrelated anatomical innovations.

Beyond evolutionary theory, the findings have practical implications for pollination biology and bio‑inspired design. Knowing that sunbirds generate suction could influence models of flower morphology, as plants may evolve tube shapes that optimize fluid flow for different pollinators. Engineers, meanwhile, can look to the bird’s tongue architecture for micro‑fluidic applications where a simple, low‑energy pump is needed. Future work will likely explore whether other nectar‑feeding birds, such as honeyeaters or sunbirds’ relatives, employ similar suction tactics, expanding the catalog of nature’s fluid‑handling strategies.