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The Guadalupe fur seal (GFS) currently is recovering from near extinction and prey availability is an important factor. Scat and stable isotope analyses (SIA) were used to assess GFS foraging on Guadalupe Island during 2013-2016. This period was characterized by normal (2013) ocean temperatures followed by warm conditions (2014-2016). Scat samples (~40/year) were collected for prey identification. Additionally, lanugo samples from 1-month-old pups (50/year) were processed for SIA (δ 13 C/δ 15 N). Interannual prey preferences were identified (ANOSIM, p < .05), including significant differences between 2013 and the anomalous years. The most important prey species among these years was the jumbo squid; followed by the neon flying squid (2014-2016). The GFS diet was more specialized in 2013-2015 and more generalized in 2016. Prey from higher trophic levels (determined by scat analysis) were

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