Gestation, Incubation, and Longevity of Selected Animals

Animal	Gestation or incubation, in days (average)	Longevity, in years (record exceptions)
Ass	365	18–20 (63)
Bear	180–240¹	15–30 (47)
Cat	52–69 (63)	10–12 (26+)
Chicken	22	7–8 (14)
Cow	280	9–12 (39)
Deer	197–300¹	10–15 (26)
Dog	53–71 (63)	10–12 (24)
Duck	21–35¹ (28)	10 (15)
Elephant	510–730¹ (624)	30–40 (71)
Fox	51–63¹	8–10 (14)
Goat	136–160 (151)	12 (17)
Groundhog	31–32	4–9
Guinea pig	58–75 (68)	3 (6)
Hamster, golden	15–17	2 (8)
Hippopotamus	220–255 (240)	30 (49+)
Horse	329–345 (336)	20–25 (50+)
Human	253–303	65² (120)
Kangaroo	32–39¹	4–6 (23)
Lion	105–113 (108)	10 (29)
Monkey	139–270¹	12–15¹ (29)
Mouse	19–31¹	1–3 (4)
Parakeet (Budgerigar)	17–20 (18)	8 (12+)
Pig	101–130 (115)	10 (22)
Pigeon	11–19	10–12 (39)
Rabbit	30–35 (31)	6–8 (15)
Rat	21	3 (5)
Sheep	144–152¹ (151)	12 (16)
Squirrel	44	8–9 (15)
Whale	365–547¹	n.a.
Wolf	60–63	10–12 (16)