| Animal | Number ofDays | Number of Months |
| Elephant (Asian) | 640 – 645 | 22 months |
| Whale (Sperm) | 480 – 500 | 16 months |
| (Finback) | 365 | |
| (Killer) | 500 | |
| Rhino (Black) | 450 – 480 | 16 months |
| Giraffe | 425 – 450 | 15 months |
| Okapi | 14 months | |
| Camel (Dromedary) | 406 | |
| (Bactrian) | 410 | 13 months |
| Tapir | 410 | |
| Zebra (Grant’s) | 365 | 12 months |
| Donkey | 365 | |
| Sea Lion | 350 – 365 | |
| Bottlenose Dolphin | 365 | |
| Horse | 337 | 11 months |
| Llama | 330 | |
| Seal | 330 | |
| Alpaca | 315 – 370 | |
| Cow (domestic) | 275 – 285 | 9 months |
| Buffalo (American) | 270 | |
| Gemsbok | 270 | |
| Otter | 270 - 300 | |
| Human | 266 | |
| Orangutan | 240 - 275 | |
| Gorilla | 257 - 266 | |
| Mandrill | 250 | |
| Eland | 250 - 270 | |
| Yak | 258 | |
| Elk | 240 – 250 | 8.5 months |
| Arabian Oryx | 240 - 250 | |
| Moose | 240 - 250 | |
| Muskox | 240 - 250 | |
| Reindeer | 215 - 245 | |
| Hartebeest | 214 - 242 | |
| Chimpanzee | 226 | 8 months |
| Monkeys | ||
| Black-handed Spider | 226 - 232 | |
| Robust Black Spider Monkey | 226 - 232 | |
| Colobus Monkey | 225 - 230 | |
| Wooly Monkey | 223 | |
| Hippopotamus | 225 - 250 | |
| White handed Gibbon | 210 | 7 months |
| Bear (Black) | 210 - 220 | |
| (Grizzly) | 225 | |
| (Polar) | 190 - 260 (delayed implantation) | |
| Deer (Mule) | 195 - 212 | |
| (White-tailed) | 205 | |
| Sloth (Linne’s two-toed) | 160 – 180 | 6 months |
| Baboon (Hamadrayas) | 170 - 187 | |
| Macaque (Celebes or Black Crested) | 174 - 196 | |
| Japanese | 170 - 180 | |
| Lion-tailed | 165 | |
| Monkey (Rhesus) | 164 | |
| (Squirrel) | 146 – 168 | 5 months |
| (Tufted or Brown Capuchin) | 149 - 158 | |
| Lemurs | ||
| Ring-tailed Lemur | 158 | |
| Collared | 120 - 135 | |
| Goat(domestic) | 151 | |
| Mouflon sheep | 150 - 180 | |
| Bighorn sheep | 180 | |
| Barbary sheep | 160 | |
| Markhor | 135 - 170 | |
| Sheep (domestic) | 148 | |
| Marmosets: | ||
| Buffy tufted | 170 | |
| Goeldi | 145 - 152 | |
| Common | 141 –145 | |
| Pygmy | 136 | |
| Tamarin | ||
| Emperor Tamarin | 150 | |
| Saddle backed Tamarin | 140-150 | |
| Golden-rumped lion | 125-132 | |
| Capybara | 150 | |
| Indian Flying Fox Bat | 140-150 | |
| Beaver | 122 | 4 months |
| Pig | 113 | |
| Porcupine | 112 | |
| Hyena | 110 | |
| Chinchilla | 110 - 120 | |
| Lion | 108 | |
| Tiger | 105 - 13 | |
| Armadillo | 104 | |
| Snow Leopard | 98 | approx. 3 – 3 ½ months |
| Leopard | 92 - 95 | |
| Clouded | 86 - 95 | |
| Cheetah | 93 | |
| Puma | 90 | |
| Cougar | 96 | |
| Striped hyena | 88 - 92 | |
| Spotted Hyena | 92 | |
| Ruffed lemur | 90 –102 | |
| Binturong | 90 | |
| Cape Hunting Dog | 80 | 2 ½ months |
| Guinea Pig | 68 | |
| Serval | 68 - 70 | |
| Caracal | 68 - 70 | |
| Wolf | 60 – 68 | 2 months |
| Maned | 67 | |
| Red | 60 - 63 | |
| Dog | 58 - 65 | |
| Otter (Asian small-clawed) | 60 - 64 | |
| Coyote | 60 - 63 | |
| Raccoon | 63 | |
| Bobcat | 60 | |
| Cat | 62 | |
| Lynx | 62 | |
| Fox (Red) | 52 | |
| Squirrel | 44 | 1 ½ months |
| Kangaroos | 30 - 42 | |
| Snowshoe Hare | 36 | |
| Rabbit | 32 | I month |
| Skunk | 31 | |
| Chipmunk | 31 | |
| Mustrat | 28 - 30 | |
| Mouse, Rat | 21 | |
| Opossum | 13 | less than one month |
Data supplied by many contributors and compiled by Carole Precious. To submit an addition/correction, please contact us.
