Little information is available on the diet of the Fuerteventura stonechat, but this species is known to be a largely insectivorous bird (9). However, it also consumes other small invertebrates (3) and berries (8), including the fruit of the box-thorn.The Fuerteventura stonechat hunts from a post site, either a bush or a stone, and will catch prey both in flight and on the ground (3) (8). When catching invertebrates on the ground, the Fuerteventura stonechat either hops or runs after its prey (3). Young stonechats are thought to be fed mainly on terrestrial insects such as grasshoppers (3).
The Fuerteventura stonechat has an early breeding season, often starting in January (3) (8) and carrying on through to April, although nests with eggs and chicks have been recorded in the middle of December (8). The male Fuerteventura stonechat will start to sing, and pairs will search for nest sites before mating begins. This species is monogamous during the breeding season (3), and the male will display to the female in the early part of this period. The courtship display involves the male slowly flicking its tail and subsequently flying at the female, to which the female will respond by hopping about and flicking its wings in an excited manner. The male Fuerteventura stonechat will then point its bill under its breast and bow forwards to expose the black colouring of the back of its neck. This movement is then followed by the two birds fluttering together just above the ground before resuming normal behaviour (3).
Most of the egg-laying occurs in February and March, once the female Fuerteventura stonechat has selected a site and built a nest. The male will accompany the female during the collection of nest material, but will not assist in building the nest itself (3). The nest is located on or very near the ground, and is a firmly built cup which is either open from above, or hidden under stones or bushes including the box-thorn (3) (8). It is built from grass, plant stems and roots, and is lined with wool, goat hair and sometimes feathers (3).
The average clutch size for the Fuerteventura stonechat is three to four eggs (3) (8), although as few as two and as many as five eggs can be laid in a single clutch (3). Each pair will normally only produce one clutch of eggs, but during wet years the breeding period may be extended and each pair can produce two clutches (10). The female Fuerteventura stonechat lays one egg a day, and will start incubating the eggs once the last egg of the clutch has been laid (3). Incubation lasts between 13 and 15 days, and is performed only by the female (3), although the male Fuerteventura stonechat will accompany the female when it leaves the nest to feed (3).
The smooth, glossy eggs of this species are usually pale green-blue with some mottling or freckling of pale reddish-brown (3). The young Fuerteventura stonechats are fed and cared for by both the male and the female, and remain in the nest for 16 to 18 days. Once the young have fledged, they will hide under dense scrub for a few days until they are able to fly well (3).
Outside of the breeding season the Fuerteventura stonechat can be found singly, in pairs or in scattered groups formed of adults and juveniles, but the species becomes territorial during the early part of the breeding season (3).