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) indicates "generally favorable reviews". Stephen Thomas Erlewine from AllMusic gave the album 4 out of 5 stars, writing, "Mraz pushes himself into new territory, creating music that's perilously close to sounding seductive." Kyle Anderson wrote for "Entertainment Weekly" that "he tiptoes the line between hammock-strung wisdom and twee naïveté with such goofball charisma that otherwise forgettable love-each-other-doodles become sweetly breezy anthems." Matthew Horton from Virgin Media wrote that "It's all light as air, of course, and corny as hell but Mraz isn't here to kick James any statues. If you're after unchallenging whimsy with the odd sparky arrangement he'll continue