Table 1 Mean ordinary abundance (ind./transect) and mean standardized abundance (individuals · [10 km ²]⁻¹ · h ⁻¹) of raptors

Cathartidae

77 ± 51.01

4.90 ± 3.04

35 ± 25.11

1.41 ± 0.96

25.13 ± 19.87

173.75 ± 41.07

Turkey Vulture (Cathartes aura)

8.38 ± 8.48

0.53 ± 0.51

3.50 ± 4.87

0.14 ± 0.18

0.75 ± 2.12

22.25 ± 6.58

Lesser Yellow-headed Vulture (Cathartes burrovianus)

0.13 ± 0.35

< 0.01 ± 0.02

-

-

0.13 ± 0.35

-

Black Vulture (Coragyps atratus)

68.38 ± 45.12

4.35 ± 2.67

31.50 ± 23.11

1.27 ± 0.88

24.25 ± 18.67

151.25 ± 38.60

King Vulture (Sarcoramphus papa)

0.13 ± 0.35

< 0.01 ± 0.02

-

-

-

0.25 ± 0.35

Accipitridae

23.00 ± 24.15

1.46 ± 1.44

15.13 ± 10.37

0.61 ± 0.36

29 ± 21.57

18.25 ± 5.96

Snail Kite (Rostrhamus sociabilis)

6.38 ± 11.81

0.41 ± 0.70

3.00 ± 6.7

0.11 ± 0.22

9.38 ± 11.85

-

Long-winged Harrier (Circus buffoni)

0.88 ± 1.13

0.06 ± 0.07

0.75 ± 0,71

0.03 ± 0.03

1.38 ± 0.92

0.50 ± 0.46

Savanna Hawk (Buteogallus meridionalis)

7.75 ± 8.17

0.49 ± 0.49

4.38 ± 3.11

0.18 ± 0.13

9.75 ± 7.00

4.75 ± 1.69

Great Black Hawk (Buteogallus urubitinga)

0.38 ± 1.06

0.02 ± 0.06

0.25 ± 0.46

0.01 ± 0.02

0.38 ± 1.06

0.50 ± 0.46

Crowned Eagle (Buteogallus coronatus)

0.13 ± 0.35

< 0.01 ± 0.02

-

-

-

0.25 ± 0.35

Roadside Hawk (Rupornis magnirostris)

5.88 ± 5.38

0.37 ± 0.31

6.50 ± 5.13

0.27 ± 0.20

8.00 ± 5.86

8.75 ± 3.70

White-tailed Hawk (Geranoaetus albicaudatus)

0.75 ± 1.75

0.01 ± 0.10

0.13 ± 0.35

< 0.01 ± 0.01

0.13 ± 0.35

1.50 ± 1.75

Black-chested Buzzard-eagle (Geranoaetus melanoleucus)

0.88 ± 1.75

0.06 ± 0.09

-

-

-

1.75 ± 1.45

Short-tailed Hawk (Buteo brachyurus)

-

-

0.13 ± 0.35

< 0.01 ± 0.01

-

0.25 ± 0.35

Falconidae

47.38 ± 14.59

3.02 ± 0.87

37.13 ± 16.23

1.47 ± 0.53

32.38 ± 9.62

104 ± 14.86

Southern Caracara (Caracara plancus)

17.63 ± 8.00

1.12 ± 0.48

13.00 ± 2.98

0.53 ± 0.13

16.88 ± 7.47

27.5 ± 4.86

Yellow-headed Caracara (Milvago chimachima)

3.13 ± 3.36

0.20 ± 0.20

4.50 ± 5.48

0.17 ± 0.19

1.25 ± 0.71

12.75 ± 5.18

Chimango Caracara (Milvago chimango)

15.38 ± 11.78

0.98 ± 0.70

5.75 ± 6.32

0.22 ± 0.23

4.75 ± 3.85

32.75 ± 11.82

American Kestrel (Falco sparverius)

10.88 ± 4.82

0.69 ± 0.29

13.88 ± 9.52

0.54 ± 0.22

9.38 ± 4.07

30.75 ± 9.05

Aplomado Falcon (Falco femoralis)

0.38 ± 0.74

0.02 ± 0.04

-

-

0.13 ± 0.35

0.50 ± 0.71

Not identified to species

-

-

1.63 ± 2.07

0.06 ± 0.08

0.13 ± 0.35

3.00 ± 2.13

Total

147.38 ± 60.97

9.38 ± 3.63

88.88 ± 30.50

3.55 ± 1.08

86.63 ± 44.04

299.25 ± 48.91