Animals

Housefly

Housefly (Musca domestica)

Hoverfly

Howler monkey

Howler monkey (Alouatta): loud, arboreal New World primates

Humboldt penguin

Humboldt penguin (Spheniscus humboldti)

Hummingbird

Humpback whale

Humpback whale (Megaptera novaeangliae)

Hungarian Vizsla

Hungarian Vizsla — medium hunting and companion dog

Hunting dog

Hyacinth macaw

Hyacinth macaw (Anodorhynchus hyacinthinus) — biology, range and conservation

Hyaena

Hyaenodontidae

Hybrid

Hybrid (biology, breeding and broader uses)

Hydra (animal)

Hydra (animal) — freshwater cnidarian polyp

Hydrozoa

Hydrozoa: biology, life cycles, diversity and ecological role

Hylarana tytleri

Hylidae

Hylidae: the tree frog family

Hylobates

Hylobates — genus of gibbons

Hylonomus

Hylonomus — an early amniote from the Pennsylvanian of Nova Scotia

Hymenoptera

Hymenoptera: wasps, bees, ants and sawflies

Hypacrosaurus

Hypacrosaurus — hollow-crested duck-billed dinosaur of the Late Cretaceous

Hyperoliidae

Hyperoliidae — African reed and sedge frogs

Hypselospinus

Hypsilophodon

Hypsilophodon: a small, fast-running Early Cretaceous ornithopod

Hyracotherium

Hyrax

Hyrax (dassie): small Afro‑Asian herbivores of the order Hyracoidea

Hyraxes (also called dassies) are compact, herbivorous mammals native to Africa and parts of southwestern Asia, notable for their unique anatomy and evolutionary relationship to el

Iberian lynx

Iberian lynx (Lynx pardinus)

Ibis

Ibis — long‑billed wading birds of the family Threskiornithidae

Ichthyophiidae

Ichthyophiidae — Asiatic tailed caecilians

Ichthyophis beddomei

Ichthyophis beddomei (Beddome's caecilian)

Ichthyornis

Ichthyornis: a toothed seabird of the Late Cretaceous

Ichthyosaur

Ichthyosaurus

Ichthyosaurus — Early Jurassic marine reptile genus

Ichthyovenator

Ichthyovenator: Early Cretaceous Asian spinosaurid with a split dorsal sail

Icterid

Icterids: New World blackbirds, orioles and their relatives

Iguana

Iguana (genus Iguana)

Iguanodon

Iguanodon: Early Cretaceous Ornithopod Dinosaur

Iguanodont

Iguanodonts: herbivorous ornithopods and their place in dinosaur classification

Impala

Impala (Aepyceros melampus): Overview, Behavior, and Conservation

Incisivosaurus

Incisivosaurus: a small, tooth-specialized theropod from the Early Cretaceous

Indian Cobra

Indian cobra (Naja naja) — spectacled cobra of the Indian subcontinent

Indian cormorant

Indian elephant

Indian fox

Bengal fox (Vulpes bengalensis): ecology, distribution, and conservation

Indian rhinoceros

Indian rhinoceros (Rhinoceros unicornis)

Indian roller

Indian softshell turtle

Indian softshell turtle (Nilssonia gangetica)

Indochinese tiger

Indohyus

Indohyus — an Eocene artiodactyl with semiaquatic adaptations linked to whales