Nest structures
Blue-capped cordon-bleus used flowers and their stems of Mollugo
nudicaulis and grasses on the outside of the nest (Fig. 2a; Fig. 5a,
c). As far as I checked the appearance of the active nest, I never
observed that red-cheeked cordon-bleus used flowers and their stems on
the outside of the nest (Fig. 5a, c–e). The domed nest seemed to be
interlaced relatively looser in red-cheeked cordon-bleus than in
blue-capped cordon-bleus (Fig. 2a, d; Fig. 5a, c–e), which was in
accordance with past descriptions (Hockey et al. 2005, van Someren
1956). The inside was lined with fine grasses and several bird feathers
(Fig. 2b, Fig. 5). Even when cordon-bleus used old weaver nests, they
added fine grasses inside (Fig. 2b, Fig. 5c, Movie S1).