The Department of Environment and Natural Resources (DENR) continues to conduct the annual Asian Waterbird Census that serves as the basis for estimates of waterbird populations. The census also monitors changes in waterbird numbers and distributions, whether local, national and international level; and knows the status of wetlands whether it is healthy, degraded or polluted.

DENR continues Asian waterbird census. (2022, February 26 - 27). Daily Guardian, p. 8.