Lehner, P. 1964 54 Oct. 17 - continued the large population of Pisania trees in the interior very in dbh from approximately 2" to 2'; many of the large ones are hollow at the base and up the trunk for 10 feet or more- it appears as though the old heartwood has rotted away and only the cambium and sapwood is supporting the tree; rats (possibly Rattus exulans) abound in both the open areas (where there is Portulacca) on the south-central part of the island and in the Pisonia forest - they have holes in the ground, under rocks and beneath Pisonia roots - in the open areas these burrows are shallow and easily dug up & they can be run down and netted or clubbed; a female Great Frigatebird was observed on a branch 20 feet below the forest canopy and was prodded into leaving to see in what way she would get to the air currents needed for controlled flight (the canopy is very effective in blocking both sunlight and wind - the light reading on my Weston IV lightmeter varied to a maximum of 3.2); when she decided to leave she dropped to & within 3 feet of the forest floor and glided toward the southern edge of the forest (about 500 from the wind direction); she dodged trees quite well but finally (Cover)