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Trivia: Animals

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Fun facts about the animal kingdom.

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What is the largest animal that has ever lived?

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  1. 1What is the largest animal that has ever lived?
    The blue whale (Balaenoptera musculus), weighing up to 190 tonnes and measuring up to 33.6 metres (110 ft)
  2. 2What is the largest terrestrial animal alive today?
    The African bush elephant (Loxodonta africana), weighing up to 12.25 tonnes and 10.67 metres long
  3. 3What were the largest terrestrial animals that ever lived?
    Titanosaur sauropod dinosaurs like Argentinosaurus (up to 73 tonnes) and Supersaurus (up to 39 metres)
  4. 4What is the smallest animal?
    Myxobolus shekel, no more than 8.5 μm when fully grown
  5. 5How many animal species have been described?
    Over 1.5 million living animal species
  6. 6How many of the described species are insects?
    Around 1.05 million
  7. 7How many total animal species are estimated to exist on Earth?
    As many as 7.77 million species
  8. 8What is the scientific study of animals called?
    Zoology
  9. 9What is the study of animal behavior called?
    Ethology
  10. 10What does the word 'animal' come from?
    Latin 'animalis' meaning 'having breath or soul'
  11. 11What does 'metazoa' mean?
    From Ancient Greek: meta (later) + zōia (animals), meaning multicellular animals
  12. 12What are the five major animal clades?
    Porifera, Ctenophora, Placozoa, Cnidaria, and Bilateria
  13. 13Which clade do most living animal species belong to?
    Bilateria
  14. 14What are the two large clades within Bilateria?
    Protostomes and deuterostomes
  15. 15Give examples of protostomes
    Arthropods, molluscs, flatworms, annelids, and nematodes
  16. 16Give examples of deuterostomes
    Echinoderms, hemichordates, and chordates (including vertebrates)
  17. 17When did animals first appear in the fossil record?
    Late Cryogenian period (around 665 million years ago)
  18. 18When did the Cambrian explosion begin?
    Around 539 million years ago
  19. 19What is the Cambrian explosion?
    The period when nearly all modern animal phyla first appeared in the fossil record as marine species
  20. 20How many groups of genes are common to all living animals?
    6,331 groups of genes
  21. 21When did the common ancestor of all animals likely live?
    About 650 million years ago during the Cryogenian period
  22. 22Who created the first hierarchical biological classification in 1758?
    Carl Linnaeus in his Systema Naturae
  23. 23How many phyla did Lamarck expand animal classification to by 1809?
    14 phyla
  24. 24Who divided the animal kingdom into Metazoa and Protozoa in 1874?
    Ernst Haeckel
  25. 25How did Aristotle divide animals?
    Into those with blood and those without
  26. 26Are animals eukaryotic or prokaryotic?
    Eukaryotic
  27. 27Are animals multicellular or unicellular?
    Multicellular
  28. 28Can animals produce their own food?
    No, animals are heterotrophs and cannot produce their own food
  29. 29How do animals obtain nutrients?
    They ingest organic material and digest it internally
  30. 30What is the extracellular matrix composed of in animals?
    Collagen and elastic glycoproteins

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