Small birds want high power meals to survive in a wide range of outdoor circumstances year round. Fig 2. Relationship between the variety of usually recognized subspecies (e.g., 8 ) within a biological species and the number of phylogenetic species acknowledged by the authors. This includes a wide variety of songbirds, shorebirds, waterfowl, raptors, and others—many species of which we have come to recognize wintering in or passing via our neighborhoods during spring and fall migration.
The researchers placed a speaker about 30 meters away from a topic fairy-wren and played the songs of four completely different people: a fairy-wren that occupied the identical territory (a co-resident or “pleasant” bird), a fairy-wren from an adjacent territory (a neighbor), a fairy-wren … Read More