Activities during the first full year of the station centered around more detailed investigations of previously reported vertebrate damage problems in Colombia. Efforts were made to delineate those considered serious and warranting intensive research. Those meeting this criteria include eared dove (Zenaida auriculate) in soybeans and sorghum; dickcissel (Spiza americana) in rice and sorghum; shiny cowbird (Molothrus bonariensis) in corn, rice, and sorghum; parrot (Psittacidae family) in sorghum and other crops; and rodent damage to coconuts and rice. Preliminary studies in the rice-growing areas of Nicaragua indicated high populations of cotton rats (Sigmodon sp.) and severe damage to the rice crop. Field trials using zinc phosphide achieved good control of the rats. (Modified author abstract)