Type: Close-up. Habitat: mixed hard and softwood forest by a river. Natural history information: This is a nest to an unknown species of bird. Nests take incredible amounts of time and energy for birds to construct, so they must factor this into their energy budget in order to reproduce. Many birds only use their nests once in a lifetime for a brief amount of time, while they care for their offspring. I chose this picture because I was intrigued by the mystery of what could have once been living there.