Upon hatching, the young are expectedly semi-altricial. The brood size averages about 2.3. The chicks initially have fine white down at first and then develop a second down coat with white to creamy white. The chicks are brooded considerably, especially by their mother for about 30 days, after which she may resume hunting. Fledgling of the chicks may occur at between 40 and 46 days of age for the young buzzards. The dependence period after they leave the nest can be relatively prolonged for a temperate-zone raptor, reaching perhaps a month in total. Breeding success rates are relatively quite poorly known in long-legged buzzards, with many sources failing to find extensive data on this topic. Data from Cyprus shows the nesting success varying greatly, perhaps based on food supplies, with an annual mean success rate varying from 46% to 93%. In northwestern China, the mean number of fledglings per nest was 0.7 while the mean fledged from successful nests was 1.4. The maximum estimated mean productivity per pair in Israel was about 0.96.