Hoyt Peckham, Ph.D., pula-maliboho ea khothaletsong ho ts'oasa lihlapi ho nts'etsapele ts'ebetso ea likepe tse thehiloeng La Paz, México, o fuoe 2014 Pew kopanelo ea paballo ea maoatle ho holisa mosebetsi oa hae oa ho khothaletsa ts'ebetso ea ho ts'oasa litlhapi lebopong la Northwest Mexico. ho lichaba tse ling tikolohong le lefatšeng ka bophara. Peckham e sebetsa le batšoasi ba litlhapi ba lehae le likoporasi tsa bona ho khutlisa boleng ba bona ba ho tšoasa litlhapi, ho matlafatsa mekhoa ea bona ea ts'ebetso ka ho eketsa tlhoko ea lijo tsa bona tsa leoatleng. Pale e Felletseng.