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
Love Is a Four Letter Word (album) of the heartbeat kind of takes precedence on this record. Medium-tempo tunes; which I love. It feels more like the pace of life. At least, based on my life and what I've been doing." On January 20, 2012, during a performance streamed live from the Bing Bar at the Sundance Film Festival, Mraz told the audience that the album's title was "Love Is a Four Letter Word". The album received favorable reviews. At Metacritic, which assigns a normalized rating out of 100 to reviews from mainstream critics, the album received an average score of 63, based on 10 reviews, which