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- Nándido moteado: (Smith, 1836) [Chordata, Aves, Galliformes, Phasianidae]
- Narval: (Linnaeus, 1758) [Chordata, Mammalia, Cetacea, Monodontidae]
- Narvallón: (Forster, 1770) [Chordata, Mammalia, Cetacea, Ziphiidae]
- Násico: (Wurmb, 1787) [Chordata, Mammalia, Primates, Cercopithecidae]
- Naso: (Linnaeus, 1758) [Chordata, Actinopterygii, Acanthuriformes, Acanthuridae]
- Nautilo: (Linnaeus, 1758) [Mollusca, Cephalopoda, Nautilida, Nautilidae]
- Nautilo de papel: (Linnaeus, 1758) [Mollusca, Cephalopoda, Octopoda, Argonautidae]
- Navaja: (Linnaeus, 1758) [Mollusca, Bivalvia, Veneroida, Solenidae]
- Navaja europea: (Linnaeus, 1758) [Mollusca, Bivalvia, Veneroida, Pharidae]
- Navaja rugosa: (Pulteney, 1799) [Mollusca, Bivalvia, Solenidae]
- Navaja transparente: (Linnaeus, 1758) [Mollusca, Bivalvia, Solenidae]
- Neblí: (Molina, 1782) [Chordata, Mammalia, Carnivora, Mustelidae]
- Nécora: (Linnaeus, 1767) [Arthropoda, Malacostraca, Decapoda, Portunidae]
- Nectarina: (Linnaeus, 1758) [Chordata, Aves, Passeriformes, Nectariniidae]
- Nectarina arañera menor: (Shelley, 1900) [Chordata, Aves, Passeriformes, Nectariniidae]
- Nectarina de pecho rojo: (Linnaeus, 1766) [Chordata, Aves, Passeriformes, Nectariniidae]
- Nectarina malaquita: (Linnaeus, 1758) [Chordata, Aves, Passeriformes, Nectariniidae]
- Nectarina de cresta roja: (Boulton, 1931) [Chordata, Aves, Passeriformes, Nectariniidae]
- Nectarina pigmea de cola larga: (Jardine, 1845) [Chordata, Aves, Passeriformes, Nectariniidae]
- Nemertino: (Gunnerus, 1770) [Nemertea, Palaeonemertea, Lineidae]
- Nemertino de cordón de bota: (Gunnerus, 1770) [Nemertea, Palaeonemertea, Lineidae]
- Ne-Ne (barnacia hawaiana): (Restall, 1973) [Chordata, Aves, Anseriformes, Anatidae]
- Neopilina: Menzies & Layton, 1963 [Mollusca, Monoplacophora, Tryblidiida, Neopilinidae]
- Nereis: (O. F. Müller, 1776) [Annelida, Polychaeta, Nereididae]
- Nevatilla: (Molina, 1782) [Chordata, Mammalia, Carnivora, Mustelidae]
- Nevatilla amarilla: (Linnaeus, 1758) [Chordata, Aves, Passeriformes, Motacillidae]
- Nevatilla de cabeza azul: (Linnaeus, 1758) [Chordata, Aves, Passeriformes, Motacillidae]
- Niala: (Angas, 1849) [Chordata, Mammalia, Artiodactyla, Bovidae]
- Nictibio: (Gmelin, 1789) [Chordata, Aves, Caprimulgiformes, Nyctibiidae]
- Nictibio común: (Gmelin, 1789) [Chordata, Aves, Caprimulgiformes, Nyctibiidae]
- Nieba arborícola: (Forster, 1771) [Chordata, Aves, Caprimulgiformes, Caprimulgidae]
- Nigua: (Linnaeus, 1758) [Arthropoda, Insecta, Hemiptera, Cimicidae]
- Nilgó: (Pallas, 1766) [Chordata, Mammalia, Artiodactyla, Bovidae]
- Niotilta varia: (Mniotilta varia (Linnaeus, 1766)) [Chordata, Aves, Passeriformes, Parulidae]
- Nocticuluca: (Kofoid & Swezy, 1921) [Protista, Dinophyceae, Noctilucales, Noctilucaceae]
- Noctua: (Linnaeus, 1758) [Animalia, Insecta, Lepidoptera, Noctuidae]
- Nóctulo: (Schreber, 1774) [Chordata, Mammalia, Chiroptera, Vespertilionidae]
- Nóctulo mediano: (Kuhl, 1817) [Chordata, Mammalia, Chiroptera, Vespertilionidae]
- Nóctulo pequeño: (Schreber, 1774) [Chordata, Mammalia, Chiroptera, Vespertilionidae]
- Notarco:
- Notarco de cuello blanco
- Notarco de cuello negro
- Notonecta: Linnaeus, 1758 [Arthropoda, Insecta, Hemiptera, Notonectidae]
- Notóptero: (Pallas, 1769) [Chordata, Actinopterygii, Osteoglossiformes, Notopteridae]
- Notornis: (Owen, 1848 (extinto)) [Chordata, Aves, Gruiformes, Notornithidae]
- Núcula o nuececilla: (Linnaeus, 1758) [Mollusca, Bivalvia, Myoida, Nuculidae]
- Nuececilla estirada: (Linnaeus, 1758) [Mollusca, Bivalvia, Nuculida, Nuculidae]
- Nuececilla tenue: (Linnaeus, 1758) [Mollusca, Bivalvia, Myoida, Nuculidae]
- Nutria: (Linnaeus, 1758) [Chordata, Mammalia, Carnivora, Mustelidae]
- Nutria africana sin garras: (Schinz, 1821) [Chordata, Mammalia, Carnivora, Mustelidae]
- Nutria canadiense: (Schreber, 1777) [Chordata, Mammalia, Carnivora, Mustelidae]
- Nutria común o europea: (Linnaeus, 1758) [Chordata, Mammalia, Carnivora, Mustelidae]
- Nutria de garras pequeñas: (Illiger, 1815) [Chordata, Mammalia, Carnivora, Mustelidae]
- Nutra gigante brasileña: (Gmelin, 1788) [Chordata, Mammalia, Carnivora, Mustelidae]
- Nutria marina: (Linnaeus, 1758) [Chordata, Mammalia, Carnivora, Mustelidae]