Table 1 Prey items delivered to nestlings by males and females of nine black-and-chestnut eagle (Spizaetus isidori) pairs in the Ecuadorian Andes. In this study, we included 16 prey items recorded in El Salado nest in 2024, as well as 310 prey items recorded in El Salado and eight additional eagle nests between 2017 and 2023, as reported by Restrepo-Cardona et al.11. The analysis include weight (W), habit (terrestrial, arboreal, scansorial), and number of prey (N).

From: Sex affects the nestling diet of a large aerial predator of the Andes

Prey item

W (kg)

Habit

Male

Female

N

N

MAMMALS

RODENTIA

Red-tailed squirrel Sciurus granatensis

0.30

Arboreal

41

13

Amazon dwarf squirrel Microsciurus flaviventer

0.10

Arboreal

1

 

Stump-tailed porcupine Coendou rufescens

0.89

Arboreal

1

4

Black agouti Dasyprocta fuliginosa

4.50

Terrestrial

4

3

Sciurus sp.a

0.44

Arboreal

5

2

LAGOMORPHA

Tapeti Sylvilagus brasiliensis

0.97

Terrestrial

4

3

Sylvilagus sp.b

0.82

Terrestrial

1

 

CARNIVORA

South American coati Nasua nasua

5.10

Scansorial

12

6

Western mountain coati Nasua olivacea

1.29

Scansorial

 

1

Long-tailed weasel Mustela frenata

0.22

Scansorial

2

1

Kinkajou Potos flavus

2.75

Arboreal

 

1

Unidentified Procyonidaec

3.19

Scansorial

1

2

PRIMATES

Colombian white-faced capuchin Cebus capucinus

3.08

Arboreal

 

1

Brown-mantled tamarin Saguinus fuscicollis

0.46

Arboreal

 

3

PILOSA

Linné’s two-toed sloth Choloepus didactylus

6.30

Arboreal

 

1

Southern tamandua Tamandua tetradactyla

6.05

Scansorial

1

 

DIDELPHIMORPHIA

Common opossum Didelphis marsupialis

1.38

Scansorial

3

1

WILD BIRDS

WILD GALLIFORMES

Sickle-winged guan Chamaepetes goudotii

0.69

Arboreal

60

23

Andean guan Penelope montagnii

0.62

Arboreal

36

8

Wattled guan Aburria aburri

1.41

Arboreal

5

 

Unidentified Cracidaed

0.66

Arboreal

6

4

COLUMBIFORMES

White-throated quail-dove Zentrygon frenata

0.31

Terrestrial

1

 

Band-tailed pigeon Patagioenas fasciata

0.34

Arboreal

12

4

Eared dove Zenaida auriculata

0.11

Terrestrial

 

1

PASSERIFORMES

Russet-backed oropendola Psarocolius angustifrons

0.22

Arboreal

2

 

Andean cock-of-the-rock Rupicola peruviana

0.24

Arboreal

 

1

PSITTACIFORMES

    

White-capped parrot Pionus seniloides

0.24

Arboreal

3

 

PICIFORMES

Emerald toucanet Aulacorhynchus prasinus

0.17

Arboreal

1

 

CAPRIMULGIFORMES

Lyre-tailed nightjar Uropsalis lyra

0.07

Scansorial

1

 

TINAMIFORMES

Grey tinamou Tinamus tao

1.60

Terrestrial

1

 

Tawny-breasted tinamou Nothocercus Julius

0.69

Terrestrial

1

 

FALCONIFORMES

Collared forest-falcon Micrastur semitorquatus

0.63

Arboreal

1

 

POULTRY (DOMESTIC GALLIFORMES)

Domestic chicken Gallus gallus

0.90

Terrestrial

21

16

Total prey

  

227

99

  1. aThis category includes two species of squirrels, Sciurus granatensis and S. igniventris, and their mean weight was assigned to both species.
  2. bThis category includes two species of rabbits, Sylvilagus brasiliensis and S. andinus, and their mean weight was assigned to both species.
  3. cThis category includes two species of coatis, Nasua nasua and N. olivacea, and their mean weight was assigned to both species.
  4. dThis category includes two species of guans, Chamaepetes goudotii and Penelope montagnii, and their mean weight was assigned to both species.
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