The Lajas Experimental Station (LAJA) is part of the NEON Altantic Neotropical domain. LAJA the relocateable terrestrial field site is located on the site of an existing agricultural experimental station owned by the University of Puerto Rico Mayagüez Campus. The NEON field site also incorporates some farmland owned by a private farmer, which makes up 25% of the total site area. It is located in the southwestern corner of the island, where it is relatively arid. The flux/meteorological tower at this site is 26' with 4 measurement levels. The data collection systems at LAJA include airborne remote sensing surveys, automated instrument measurements and observational field sampling.There are also multiple plots for soil sensors and sampling and organismal sampling including birds, ticks and mosquitoes. At both D04 LAJA and GUAN terrestrial field sites, scientists collected small mammal data from 2016-2017. Small mammal sampling protocols are currently suspended due to safety issues.