Flightless bird requirement for flightlessness. The kiwi does not exhibit gigantism, along with tinamous, even though they coexisted with the moa and rhea that both exhibit gigantism. This could be the result of different ancestral flighted birds arrival or because of competitive exclusion. The first flightless bird to arrive in each environment utilized the large flightless herbivore or omnivore niche, forcing the later arrivals to remain smaller. In environments where flightless birds are not present, it is possible that after the K/T Boundary there were no niches for them to fill. They were pushed out by other herbivorous mammals. New Zealand had
South American Bird Fair Horacio Matarasso and consists of respected birdwatchers in the region. See Pictures at album South American Bird Fair The South American Birdwatching Fair is an annual event for birdwatchers, held every year in a different country of the continent. It is described as the birder's principal meeting in South America, with people from all the world. Lovers of wildlife in general and Birdwatching in particular can find in the fair a space for networking and sharing talks, workshops, seminars and birding trips. Each year's programme includes birding themes in general, recent scientific findings and presentations in many related themes. A