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Table 1 Frequency of occurrence and biomass of 120 long-eared owl pellets from wintering roosts in Janos, Chihuahua, México collected in 2007

From: Winter diet of the long-eared owl Asio otus (Strigiformes: Strigidae) in the grasslands of Janos, Chihuahua, Mexico

Prey FR FR% Biomass (gr) B%
Mammals 135 95.74 11059 100
Soricidae 1 0.71 5 0.04
Leporidae 1 0.71 1002 9.06
 Desert cottontail (Sylvilagus audubonii) 1 0.71 1002 9.06
Cricetidae 77 54.61 8924 80.69
 White-throated woodrat (Neotoma albigula) 6 4.26 1035 9.36
 Southern grasshopper mouse (Onychomys torridus) 8 5.67 200 1.81
 North american deermouse (Peromyscus maniculatus) 2 1.42 45 0.41
 Tawny-bellied cotton rata (Sigmodon fulviventer) 22 15.60 2398 21.68
 Hispid cotton rat (Sigmodon hispidus) 17 12.06 2848 25.75
 Cotton rat (Sigmodon sp.) 22 15.60 2398 21.68
Heteromyidae 39 27.66 1129 10.20
 Merriam's kangaroo rat (Dipodomys merriami) 1 0.71 43 0.38
 Ord's kangaroo rat (Dipodomys ordii) 4 2.84 292 2.64
 Banner-tailed kangaroo rata (Dipodomys spectabilis) 4 2.84 534 4.83
 Kangaroo kat (Dipodomys sp.) 1 0.71 43 0.38
 Silky pocket mouse (Perognathus flavus) 29 20.57 218 1.97
 Unidentified rodents 17 12.06 - -
Unidentified birds 1 0.71 - -
Insects 4 2.84 - -
 Orthoptera: Acriididae 3 2.13 - -
 Coleoptera 1 0.71 - -
Vertebrates 137 97.16 - -
Invertebrates 4 2.84 - -
  1. aNew records of prey for the long-eared owl