| adrenarche | estrous cycle |
| Agoutis (Dasyproctidae) (zoology) | estrous cycle |
| Amberen | Eurasian wild pig |
| American Red Squirrel | European hare |
| Artiodactyla (Even-Toed Ungulates) (zoology) | Fashion (horse) |
| Babirusa | fertilisation |
| Banner-tailed kangaroo rat | follicular phase |
| Black-tailed deer | gametogenesis |
| Bobcat | Gerenuk |
| Bovids IV: Dikdiks, Beiras, Grysboks, and Steenboks (Neotraginae) (zoology) | Giant kangaroo rat |
| Calabar Angwantibo | giraffe |
| Camels, Guanacos, Llamas, Alpacas, and Vicuñas (Camelidae) (zoology) | Gliding and Striped Possums (Petauridae) (zoology) |
| Cats (Felidae) (zoology) | Golden hamster |
| Cheetah | Green acouchi |
| Chiroptera (Bats) (zoology) | Hamadryas Baboon |
| Common spotted cuscus | Hares and Rabbits (Leporidae) (zoology) |
| corpus luteum | Heat (disambiguation) |
| Coypus (Myocastoridae) (zoology) | Hispaniolan Hutia |
| cycle | Hispaniolan solenodon |
| Dasyuromorphia (Australasian Carnivorous Marsupials) (zoology) | Hog deer |
| Desert gundi | Hominidae II (Humans) (zoology) |
| diestrus (physiology) | Honey Possums (Tarsipedidae) (zoology) |
| Diprotodontia (Koala, Wombats, Possums, Wallabies, and Kangaroos) (zoology) | horse behavior |
| dog | horse breeding |
| Dormice (Myoxidae) (zoology) | Horses, Zebras, and Asses (Equidae) (zoology) |
| Dwarf Lemurs and Mouse Lemurs (Cheirogaleidae) (zoology) | House Mouse |
| Eastern Fork-marked Lemur | human physiology |
| Edgar Allen (American endocrinologist) | Hutias (Capromyidae) (zoology) |
| estral | Hyemoschus aquaticus |
| estral cycle | Impala |
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