Tree use
We classified tree use based on the tree species occupied
by an individual at the time of relocation and proportion
of species used was calculated for each sloth. Tree
species were identified with aid of Zuchowski (2007) and
following the nomenclature of Hammel et al. (2003). We
used a likelihood ratio test for goodness-of-fit to compare
tree use between the two sloth species. Using these data,
we also characterized the diversity of tree species used
by each individual and by all individuals pooled for each
species with Simpson’s index of diversity.
Habitat selection
We characterized second- and third-order habitat
selection to identify habitat characteristics preferred by
the two-andthe three-toed sloth (Johnson1980). Secondorder
habitat selection reflects the habitat features that
individuals use to select the location of their home range,
whereas third-order selection reflects the habitat features
that individuals preferentially use within their home
range. For this analysis, we only included individuals
that had a minimum of 16 relocations and that were
not dispersing from their home range. We estimated
home ranges using 90% fixed kernel methods for 34
adult resident two-toed sloths (median = 64 relocations;
range: 16–179) and 33 (n = 30 adults; n = 3 subadults)
three-toed sloths (median = 50 relocations; range = 20–
212). Home ranges were delineated using ESRI’s ArcGIS
10.1 and the Geospatial Modelling Environment with
least-squares cross-validation (LSCV) as the smoothing
parameter (Millspaugh & Marzluff 2001). To evaluate
second-order habitat selection, we considered used
habitat as the proportion of each habitat type in each