Animals with longest pregnancy period

 I have listed fown the animals with longest pregnancy period and the time duration.

1.  Frilled sharks ,  3 and half a year 

2.  Black Alpine salamander ,  2 to 3 years

3.  Elephants,  22 months

4.   Sperm whales,  14 to 16 months 

5.   Black Rhinoceros ,.  15  to 16 months

6.  Giraffe ,  15  months 

7.  Camel ,  13  to  15 months

8.  Zebra ,   11 to  13  months