Encyclopedia of Animals

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a b c Rothmaler, Werner (1951). "Die Abteilungen und Klassen der Pflanzen". Feddes Repertorium, Journal of Botanical Taxonomy and Geobotany. 54 (2–3): 256–266. doi: 10.1002/fedr.19510540208. How many species on Earth? About 8.7 million, new estimate says". 24 August 2011. Archived from the original on 1 July 2018 . Retrieved 2 March 2018. Hervé, Philippe; Lartillot, Nicolas; Brinkmann, Henner (May 2005). "Multigene Analyses of Bilaterian Animals Corroborate the Monophyly of Ecdysozoa, Lophotrochozoa, and Protostomia". Molecular Biology and Evolution. 22 (5): 1246–1253. doi: 10.1093/molbev/msi111. PMID 15703236. History of Falconry". The Falconry Centre. Archived from the original on 29 May 2016 . Retrieved 22 April 2016.

With stringent animal welfare guidelines in place for all tour operators, it's easy to have a wildlife encounter that is rewarding and positive - for both you and our precious animals. Follow our simple guidelines to experience wildlife responsibly and be sure to read our top tips for spotting wildlife. Zimorski, Verena; Mentel, Marek; Tielens, Aloysius G. M.; Martin, William F. (2019). "Energy metabolism in anaerobic eukaryotes and Earth's late oxygenation". Free Radical Biology and Medicine. 140: 279–294. doi: 10.1016/j.freeradbiomed.2019.03.030. PMC 6856725. PMID 30935869.

Ros-Rocher, Núria; Pérez-Posada, Alberto; Leger, Michelle M.; Ruiz-Trillo, Iñaki (2021). "The origin of animals: an ancestral reconstruction of the unicellular-to-multicellular transition". Open Biology. The Royal Society. 11 (2): 200359. doi: 10.1098/rsob.200359. ISSN 2046-2441. PMC 8061703. PMID 33622103. Nielsen, Claus (2008). "Six major steps in animal evolution: are we derived sponge larvae?". Evolution & Development. 10 (2): 241–257. doi: 10.1111/j.1525-142X.2008.00231.x. PMID 18315817. S2CID 8531859. Reilly, Michael (20 November 2008). "Single-celled giant upends early evolution". NBC News. Archived from the original on 29 March 2013 . Retrieved 5 December 2008. EU statistics show decline in animal research numbers". Speaking of Research. 2013. Archived from the original on 6 October 2017 . Retrieved 24 January 2016.

Protostomes and deuterostomes differ in several ways. Early in development, deuterostome embryos undergo radial cleavage during cell division, while many protostomes (the Spiralia) undergo spiral cleavage. [142] Leroi, Armand Marie (2014). The Lagoon: How Aristotle Invented Science. Bloomsbury. pp.111–119, 270–271. ISBN 978-1-4088-3622-4. Kim, Chang Bae; Moon, Seung Yeo; Gelder, Stuart R.; Kim, Won (September 1996). "Phylogenetic Relationships of Annelids, Molluscs, and Arthropods Evidenced from Molecules and Morphology". Journal of Molecular Evolution. 43 (3): 207–215. Bibcode: 1996JMolE..43..207K. doi: 10.1007/PL00006079. PMID 8703086. Population decline of a species can be attributed to habitat loss or degradation, invasive species, natural disasters and climate change - just to name a few. Quokka: Dubbed the “world’s happiest animal”, quokkas are only found onRottnest Island, near Perth. Their friendly nature and adorable smiles have made them an internet sensation with many people snapping quokka selfies.Adl, Sina M.; Bass, David; Lane, Christopher E.; Lukeš, Julius; Schoch, Conrad L.; Smirnov, Alexey; Agatha, Sabine; Berney, Cedric; Brown, Matthew W. (2018). "Revisions to the Classification, Nomenclature, and Diversity of Eukaryotes". Journal of Eukaryotic Microbiology. 66 (1): 4–119. doi: 10.1111/jeu.12691. PMC 6492006. PMID 30257078. The Tree of Life". The Burgess Shale. Royal Ontario Museum. 10 June 2011. Archived from the original on 16 February 2018 . Retrieved 28 February 2018. Espèce de". Reverso Dictionnnaire. Archived from the original on 28 July 2013 . Retrieved 1 March 2018.

Cannon, Johanna T.; Vellutini, Bruno C.; Smith III, Julian.; Ronquist, Frederik; Jondelius, Ulf; Hejnol, Andreas (3 February 2016). "Xenacoelomorpha is the sister group to Nephrozoa". Nature. 530 (7588): 89–93. Bibcode: 2016Natur.530...89C. doi: 10.1038/nature16520. PMID 26842059. S2CID 205247296. Archived from the original on 30 July 2022 . Retrieved 21 February 2022. Tasmanian devil:Living up to their namesake, these small, feisty carnivores are found in the southern state of Tasmania. Among other fun facts, devils have powerful jaws used to devour their entire prey and are spectacular tree climbers.

Further information: Largest organisms and Smallest organisms The blue whale is the largest animal that has ever lived.