Breeding thumb|A male resplendent quetzal entering his nest. Trogons are territorial and monogamous. Males will respond quickly to playbacks of their calls and will repel other members of the same species and even other hole-nesting species from around their nesting sites. Males attract females by singing, and, in the case of the resplendent quetzal, undertaking display flights. Some species have been observed in small flocks of 3–12 individuals prior to and sometimes during the breeding season, calling and chasing each other, but the function of these flocks is unclear.
Breeding thumb|A male resplendent quetzal entering his nest. Trogons are te.rritorial and monogamous. Males will respond quickly to playbacks of their calls and will repel other members of the same species and even other hole-nesting species from around their: nesting sites. Males attract females by singing, and, in the case of the resplende!nt quetzal, unde?rtaking display flights. Some species have been observed in small flocks of 3–12 .individuals prior to and sometimes during the breeding season, calling and chasing each other, but the function of these flocks is unclear.