The site consists of a single, huge, 25-m-high kapok tree, Ceiba pentandra, near the village of Boa Entrada in Santa Catarina (Assomada) region on the island of Santiago. The area is intensively used for agricultural purposes, in particular for the cultivation of sugar-cane, and there are many mango Mangifera indica trees in the surrounding area. The kapok grows in the valley bottom, and a steep track leads down this valley from the town of Assomada.
See Box for key species. This site is, with CV007, one of only two known breeding colonies of the endemic Ardea (purpurea) bournei. Formerly, a third colony existed at São Domingos, but was destroyed when the trees used for nesting were felled in the early 1970s. In 1993, the total population of A. (purpurea) bournei numbered 20–25 pairs at most. Between 1988–1993, 4–6 pairs bred at this site, but in 1998–2000 this had declined to only 1–2 pairs. Nesting takes place in the crown of the tree. During the 1960s, nests were also found in mango trees not far from the kapok, but this has not been observed since. Acrocephalus brevipennis breeds in the area.
Non-bird biodiversity: The kapok is easily the largest tree on the island of Santiago and, probably, the whole country; it is worthy of preservation even without the presence of the heron colony.
BirdLife International (2018) Important Bird Areas factsheet: Kapok tree, Boa Entrada. Downloaded from http://www.birdlife.org on 15/11/2018.