Bird nest July to September), it is not in others, and the swiftlets are declining in areas where the harvest reaches unsustainable levels. Some species of birds are also considered nuisances when they nest in the proximity of human habitations. Feral pigeons are often unwelcome and sometimes also considered as a health risk. The Beijing National Stadium, principal venue of the 2008 Summer Olympics, has been nicknamed "The Bird Nest" because of its architectural design, which its designers likened to a bird's woven nest. In the Victorian era, naturalists often collected bird's eggs and their nests. The study of bird nests is
The Echo Nest 2010, The Echo Nest received a $7 million venture financing from Matrix Partners and Commonwealth Capital Ventures. In July 2012 The Echo Nest received a $17.3 million Series D venture financing from Norwest Venture Partners, Matrix Partners, Commonwealth Capital Ventures and Jim Pallotta. In March 2014, The Echo Nest was acquired by Spotify for 49.7 million euro, consisting cash and Spotify's equity. The Echo Nest's product line was based on their automatically-derived database of data about 30 million songs aggregated from web crawling, data mining, and digital signal processing techniques. The company also made its data available to developers via