Our captive Hardwicke’s woolly bats (Kerivoula hardwickii) preferred pitchers of bat-adapted Nepenthes hemsleyana plants (see previous blogs), and all woolly bats radio-tracked by Michael and Caroline Schöner in their primary study area consistently returned to the preferred N. hemsleyana pitchers. However the Schöners also found woolly bats in other kinds of plants. Even in their study area they occasionally found an apparently desperate bat roosting in fanged pitcher plants (Nepenthes bicalcarata). This amazing plant relies on a pair of sharp, fang-like, nectar-producing structures above its entrance to facilitate capture of ants that climb down to reach nectar. Approaching ants lose their footing near the tips of the narrowing “fangs,” falling into the water-filled pitchers. Bats can use these pitchers only if they are first drained. This requires a drain hole near the base. No one yet knows whether these holes are made by inventive woolly bats short on alternative shelter or by birds or other animals, perhaps seeking a meal of captured insects.
Heavy and unpredictable rains made field photography in Brunei difficult. It was a great relief when we were finally able to obtain mealworms so we could keep tiny woolly bats (Kerivoula hardwickii) in our studio. Weighing less than a US nickel, they had been considered too small to be kept in captivity longer than overnight. But under Merlin’s watchful eye, we were able to tame and keep a cast of four. In fact, they turned out to be some of the most fun bats we’ve worked with. By the second night they had learned to come to our hands for mealworms without our even trying to teach them, and soon learned to get Merlin’s attention when hungry by literally getting in his face.
Merlin and I arrived in the capital city of Brunei, Bandar seri Begawan, on August 10th with only four of our five checked bags of 350 pounds of gear and equipment. Caroline and Michael Schöner, our hosts, met us at the airport to take us to the house they had been renting on the Labi Forest Road, a two-hour drive from the capital on the coast to the interior of Brunei. They had additional bad news. The local pet store was out of mealworms needed to feed the bats we intended to photograph in our sudio, and it would be five days till more arrived. That was also how long it took for our missing luggage containing essential tripods and flash stands to materialize. Finally, even when everything did arrive, the electricity failed, preventing us from using fans for cooling. Our small, tin-roofed cottage got so hot that we barely survived, though all of our newly purchased mealworms, kept in the same room with us, died. Another long drive to the capital was required to purchase more, further delaying us from keeping bats in our studio.