Abstract
The Bar-tailed Lark (Ammomanes cinctura) breeds in desert and semi-desert areas of the Saharo-Sindian region, from north-west Africa through the arid plains of the Arabian Peninsula to the Sind. Despite having a wide distribution, little information is available on the breeding ecology of this species. This study was conducted in a desert in the north of Saudi Arabia, where the daytime ambient temperature may exceed 40 °C. In contrast, the night ambient temperature may reach less than 10 °C in late spring and early summer. The objectives of this study were to collect some baseline data on some aspects of the breeding ecology of this species and to record the nest attendance behavior. The study found that Bar-tailed Larks preferred to nest under shrub trunks, which may camouflage both nests and incubating parents against predators and protect eggs, nestlings and incubating parents from hostile weather conditions. Moreover, nest attendance was high, as Bar-tailed Lark parents incubated their eggs 95.97 ± 2.62% over the entire day, and they seemed to maintain the eggs at temperatures around 23–33 °C. In addition, they incubated more at night than during the daytime. Temperatures under the shrubs at night fell below 21 °C, thus parents increased the nest attendance to warm the eggs and prevent the embryos from exposure to lethal temperatures.