The dietary intake of these large waterfowl is varied, dependent upon habitat and season. They consume a range of aquatic vegetation, including submerged plants like pondweed and algae. On land, their diet extends to grasses, grains, and occasionally, agricultural crops. Small invertebrates also constitute a portion of their nutritional intake, particularly for young cygnets requiring protein for growth.
Understanding the feeding habits of these birds is important for conservation efforts. Knowing their preferred food sources helps in managing habitats to ensure adequate sustenance. Historically, the availability of appropriate food sources has played a significant role in swan populations and their distribution across various ecosystems. Agricultural practices can also inadvertently impact their food availability, creating both opportunities and challenges for their survival.