How does pollination occur in Tulips?

Tulips cross pollinate naturally with the aid of pollinators like birds, butterflies, and bees. The pollen attaches itself to the pollinators while they are feeding on the flower's nectar. Then the pollinators accidentally transfer the pollen when at a second flower. You can cross-pollinate tulips by hand and is usually done if there are no pollinators or if there are desired traits that the gardener wishes to pass off to the offspring