They're holding the official guidebook from the Volume 4 Blu-ray.
The last frame references the Kemono Friends short for Animelo Summer Live 2017, which was held at Saitama Super Arena. The owls are at the ruins of the arena and talk about concert-going etiquette. See http://www.crunchyroll.com/anime-news/2017/08/30-1/.
Updated
Eh... then why have you been...ReflectingLately, Kaban hasn't been reading books to us.Maybe exposing how wise we are wasn't very wise.Talons should be hidden. From the saying "A skilled hawk hides its talons."