Red-Billed Oxpecker

The Red-Billed Oxpecker (Buphagus erythrorynchus) is a passerine bird in the oxpecker family. It is native to the savannah of Africa, from the Central African Republic east to South Sudan and south to northern and eastern South Africa. Its range overlaps that of the Yellow-Billed Oxpecker. 
Description
A oxpecker is darker brown than its parents. Its bill is dark olive at first, but gradually takes on adult colouration after four months. Its flight is strong and direct, and their call is a hissy crackling trik-quisss.
Behaviour
The red-billed oxpecker nests in tree holes. It lays 2–5 eggs, with three being the average. Outside the breeding season it forms large, chattering flocks.
The habitat is open country, and the red-billed oxpecker eats insects. It perches on large wild and domesticated mammals such as cattle and eating ticks.