Animals

Nocturnal animals

Nodosauridae

Nodosaurus

North Pacific giant octopus

North Pacific Giant Octopus (Enteroctopus dofleini)

Northern bat

Northern bat (Eptesicus nilssonii)

Northern bluefin tuna

Northern corroboree frog

Northern corroboree frog (Pseudophryne pengilleyi)

Northern goshawk

Northern green frog

Northern green frog (Rana/Lithobates clamitans melanota)

Northern hawk-owl

Northern hawk-owl (Surnia ulula)

Northern pike

Northern pike (Esox lucius): biology, range, and human interactions

Northern pintail

Northern pintail (Anas acuta)

Northern pygmy owl

Northern pygmy owl (Glaucidium gnoma)

Northern white rhinoceros

Northern white rhinoceros (Ceratotherium simum cottoni)

Norwegian Elkhound

Norwegian Forest cat

Notaden

Nothosaur

Notoceratops

Notoceratops — a disputed southern horned dinosaur

Notostraca

Notostraca (tadpole shrimps): biology, life cycle, and fossil history

Nova Scotia Duck Tolling Retriever

Nova Scotia Duck-Tolling Retriever

Nudibranch

Nudibranchs: colorful shell‑less marine gastropods

Numbat

Numbat (Myrmecobius fasciatus): the banded termite-eating marsupial

Nurosaurus

Nurosaurus — informal name for a Cretaceous sauropod from Inner Mongolia

Nurse shark

Nurse shark (Ginglymostoma cirratum)

Nuthatch

Nyala

Nyasasaurus

Nyasasaurus — a fragmentary reptile that may be the earliest dinosaur

Nyctibatrachus

Nyctosaurus

Nyctosaurus: a Late Cretaceous pterosaur

Nymphalidae

Nymphalidae: the brush-footed butterflies

Oarfish

Oarfish (Regalecidae): ribbonlike deep‑sea fishes and their history

Obdurodon

Obdurodon: an extinct toothed monotreme genus

Ocean sunfish

Ocean sunfish (Mola mola): description, behavior, and ecological role

Oceanic dolphin

Oceanic dolphins (family Delphinidae)

Oceanic whitetip shark

Ocellated turkey

Ocellated turkey (Meleagris ocellata)

Ocelot

Ocelot (Leopardus pardalis): description, range, behavior and conservation

Ocicat

Ocicat: domestic cat breed with wild-looking spotted coat

Octopoda

Octopodiformes

Octopus

Octopus: biology, behavior, and relationship with humans

Odonata

Odontoceti

Odontochelys

Okapi

Okapi (Okapia johnstoni) — Central African forest giraffid

Old Major (Animal Farm)

Old World flycatcher

Old World Flycatchers (family Muscicapidae)