[citation needed] Up to three white eggs are laid in the fork of a branch, and are incubated by the female at night and the male in the day.

[citation needed] DNA-DNA hybridisation studies had suggested that the two frogmouth groups may not be as closely related as previously thought, and that the Asian species may be separable as a new family, the Batrachostomidae.

[3][4] Although frogmouths were formerly included in the order Caprimulgiformes, a 2019 study estimated the divergence between Podargus and Batrachostomus to between 30 and 50 mya and forming a clade well separated from the nightjars and being a sister group of the swifts, hummingbirds, and owlet-nightjars.

[5] In a journal article published in April 2021, researchers Katja Thömmes and Gregor Hayn-Leichsenring from the Experimental Aesthetics group at the University Hospital Jena, Germany, found the frogmouth to be the most "instagrammable" bird species.

[6] Using an algorithm to analyze the aesthetic appeal of more than 27,000 bird photographs on Instagram, they found that photos depicting frogmouths received the highest number of likes relative to the posts' exposure to users.