43 pages matching penis in this book
Results 1-3 of 43
What people are saying - Write a review
We haven't found any reviews in the usual places.
Structure of Sex Organs
Sex Differences Between Males and Females
12 other sections not shown
antelope antlers bear beaver become belly birds body breeding season brood buck buffalo bull burrow calf caribou castoreum claws comes into heat copulation courtship coyote deer eggs fawn feet female's fertility fight fish ground harem herd hind legs hoofed hormones human hundred larger lemming licking lion litter live male and female male's mammalian mothers mammals marten mating mature mice migration milk mink minutes monogamous months moose mountain goat mouse musk musk ox neck nose nursing offspring once opossum organs otter ovulation ovum pair penis perhaps period pocket gopher porcupine predators pregnancy pups rabbit reproductive rate rival rodents scent glands scrotum sea otter seal seems seldom sex organs sexual heat shrew skunk sometimes species sperm squirrel stimulation tail teeth testicles tiny tion tree usually uterus vagina vulva weeks whale wild animal winter wolf young