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Table 1 Number of giraffes including age (year-month), year of data collection and total recording time for each institution

From: Nocturnal “humming” vocalizations: adding a piece to the puzzle of giraffe vocal communication

Study site

Giraffe species

Year, month

N

Males

Females

Rec time (hh:mm:ss)

Adult

Subadult

Young

Newborn (months)

Adult

Subadult

Young

Newborn

Berlin Tierpark

Giraffa c. rothschildi

2011, Oct

11

21 Years 5 months

 

1 Year 1 month

2

24 Years 5 months

1 Year 8 months

  

135:21:39

       

12 Years 2 months

   
        

9 Years 4 months

   
        

8 Years 2 months

   
        

4 Years 7 months

   
        

4 Years 2 months

   
  

2012, Nov

9

22 Years 6 months

 

1 Year 3 months

 

13 Years 3 months

  

5 Months

109:10:00

        

10 Years 5 months

  

4 Months

        

9 Years 3 months

   
        

5 Years 8 months

   
        

5 Years 3 months

   
  

2014, Apr

8

 

2 Years 9 months

 

5

14 Years 9 months

   

336:01:24

       

0

11 Years 11 months

   
        

10 Years 8 months

   
        

7 Years 2 months

   
        

6 Years 8 months

   

Copenhagen Zoo

Giraffa c. reticulata

Mar, 2014

7

7 Years 11 months

  

4

7 Years 7 months

1 Year 9 months

8 Months

 

107:58:53

        

7 Years 8 months

   
        

10 Years 8 months

   

Vienna Zoo

Giraffa c. rothschildi

Apr, 2014

4

20 Years 9 months

 

9 Months

 

17 Years

   

144:24:17

        

8 Years 6 months

   
  

Oct − Dec, 2007

4

14 Years 3 months

  

1

8 Years 6 months

   

114:16:13

        

2 Years

   
  1. Age classification based on Le Pendu et al. [44]: newborn: <6 months; young: 6–18 months; subadult: 18 months to 4 years; adult: >4 years