Why Starlings Don't Need a Vet: Birds Use Herbs to Protect Their Young

Common starlings exhibit a highly specific behavior to protect their young: they weave fresh herbs into their nests. Plants such as yarrow, wild carrot, and mint, rich in aromatic substances, are used to create a natural defense against parasites like mites, fleas, and ticks, as well as bacterial infections.

This practice, known as zoopharmacognosy, allows the birds to self-medicate their offspring without the need for external veterinary intervention. Male starlings are primarily responsible for gathering these herbs, which also serves as a form of courtship and attention towards females. The pleasant scents are believed to positively influence females and stimulate the chicks' immune systems.

Chicks raised in these "herbal" nests tend to be heavier and have better survival rates. They also exhibit higher hemoglobin levels and a greater tendency to return to the colony in subsequent years after fledging. Wormwood is another plant starlings utilize, its aroma acting as a natural fumigant against insects. Elderflower, willow leaves, and marigold are also part of the birds' natural pharmacy.

Starlings are meticulous in maintaining their nests, regularly replacing dried-out herbs with fresh ones to ensure the continued efficacy of their aromatic and medicinal properties. This sophisticated natural behavior has historical parallels with human folk medicine, where observing birds may have contributed to understanding the healing properties of certain plants.