Description: This data represents orang-utan nest survey data, collected to investigate the effects of habitat disturbance on orang-utan populations. Our surveys were conducted in and around the SAFE project site, including areas of Ulu Segama forest reserves and surrounding oil palm estates, covering a total study area of ca. 13,000ha. We conducted nest surveys between April and August 2017, using the standing crop method. Transects were surveyed once by teams of two to four people walking at a steady pace of roughly 0.5km/hr. The data primarily contains perpendicular distances from directly under each nest we encountered to the transect line. We assigned a decay category to each nest, ranging from 1 (new nest) to 5 (heavily degraded). Additionally we recoded the location of each nest, the height of the nest and DBH of the host tree. Project: This dataset was collected as part of the following SAFE research project: The effect of tropical forest modification on primate population density and diversity.Funding: These data were collected as part of research funded by: NERC - Human Modified Tropical Forest (HMTF) (Standard grant, NE/K016407/1, http://lombok.nerc-hmtf.info/)Primate Society of Great Britain (Conservation grant, NA, http://www.psgb.org/conservation_grants.php)This dataset is released under the CC-BY 4.0 licence, requiring that you cite the dataset in any outputs, but has the additional condition that you acknowledge the contribution of these funders in any outputs.Permits: These data were collected under permit from the following authorities:Sabah Biodiversity Centre (Research licence JKM/MBS.1000-2/2 JLD.4(104))XML metadata: GEMINI compliant metadata for this dataset is available hereFiles: This consists of 1 file: Orangutan_Transect_Data.xlsxOrangutan_Transect_Data.xlsxThis file contains dataset metadata and 1 data tables:Orang-utan nest survey data (described in worksheet Distance_data)Description: Data from orang-utan nest surveys, using the standing crop method to collect perpendicular distances of orang-utan nests from line transects.Number of fields: 13Number of data rows: 677Fields: Region: Area in which the survey took place (Field type: ID)Habitat_Type: Habitat type of the transect location (Field type: ID)Transect: Transect ID (Field type: Location)TranLenght: Transect length (Field type: Numeric)Side: Side of the transect nest was located (L = left, R= Right and OT= On transect) (Field type: Categorical)Dist: Perpendicular distance from direct under nest to the transect line (Field type: Numeric)Slope: Angle of slope from transect line (measured to compensate for measuring perpendicular distance of steel slopes) (Field type: Numeric)Class: Age class of east nest (From 1 = new nest to 5 = very old nest) (Field type: Numeric)Nest_Height: Height of each nest in host tree (Field type: Numeric trait)DBH: DBH of host tree (Field type: Numeric)Lat_Y: Nest location latitude (Field type: Latitude)Long_X: Nest location longitude (Field type: Longitude)Elevation: Height above sea leave at each nest location (Field type: Numeric)Date range: 2017-04-01 to 2017-08-28Latitudinal extent: 4.5634 to 4.7822Longitudinal extent: 117.4637 to 117.7008Taxonomic coverage: All taxon names are validated against the GBIF backbone taxonomy. If a dataset uses a synonym, the accepted usage is shown followed by the dataset usage in brackets. Taxa that cannot be validated, including new species and other unknown taxa, morphospecies, functional groups and taxonomic levels not used in the GBIF backbone are shown in square brackets.Animalia - Chordata - - Mammalia - - - Primates - - - - Hominidae - - - - - Pongo - - - - - - Pongo pygmaeus