Some animals are capable of asexual reproduction, which often results in a genetic clone of the parent. This may take place through fragmentation; budding, such as in Hydra and other cnidarians; or parthenogenesis, where fertile eggs are produced without mating, such as in aphids. [38] [39] Ecology Predators, such as this ultramarine flycatcher ( Ficedula superciliaris), feed on other animals.

Jones, Jonathan (27 June 2014). "The top 10 animal portraits in art". The Guardian. Archived from the original on 18 May 2016 . Retrieved 24 June 2016.

Mora, Camilo; Tittensor, Derek P.; Adl, Sina; Simpson, Alastair G.B.; Worm, Boris (23 August 2011). Mace, Georgina M. (ed.). "How Many Species Are There on Earth and in the Ocean?". PLOS Biology. 9 (8): e1001127. doi: 10.1371/journal.pbio.1001127. PMC 3160336. PMID 21886479. How Shellac Is Manufactured". The Mail (Adelaide, SA: 1912–1954). 18 December 1937. Archived from the original on 30 July 2022 . Retrieved 17 July 2015. Garrett, Reginald; Grisham, Charles M. (2010). Biochemistry. Cengage Learning. p. 535. ISBN 978-0-495-10935-8. Minkoff, Eli C. (2008). Barron's EZ-101 Study Keys Series: Biology (2nd, reviseded.). Barron's Educational Series. p.48. ISBN 978-0-7641-3920-8.

Introduction to Placozoa". UCMP Berkeley. Archived from the original on 25 March 2018 . Retrieved 10 March 2018. Medicines by Design". National Institute of Health. Archived from the original on 4 June 2016 . Retrieved 9 July 2016. 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.Alcamo, Edward (1998). Biology Coloring Workbook. The Princeton Review. p.220. ISBN 978-0-679-77884-4. Ben-Tor, Daphna (1989). Scarabs, A Reflection of Ancient Egypt. Jerusalem: Israel Museum. p.8. ISBN 978-965-278-083-6. Castro, Peter; Huber, Michael E. (2007). Marine Biology (7thed.). McGraw-Hill. p.376. ISBN 978-0-07-722124-9. Breyer, J. A. (1995). "Possible new evidence for the origin of metazoans prior to 1 Ga: Sediment-filled tubes from the Mesoproterozoic Allamoore Formation, Trans-Pecos Texas". Geology. 23 (3): 269–272. Bibcode: 1995Geo....23..269B. doi: 10.1130/0091-7613(1995)023<0269:PNEFTO>2.3.CO;2.

Pusey, Anne; Wolf, Marisa (1996). "Inbreeding avoidance in animals". Trends Ecol. Evol. 11 (5): 201–206. doi: 10.1016/0169-5347(96)10028-8. PMID 21237809. Animals are multicellular eukaryotic organisms in the biological kingdom Animalia. With few exceptions, animals consume organic material, breathe oxygen, are able to move, reproduce sexually, and grow from a hollow sphere of cells, the blastula, during embryonic development. Over 1.5 million living animal species have been described—of which around 1 million are insects—but it has been estimated there are over 7 million in total. Animals range in size from 8.5millionths of a metre to 33.6 metres (110ft) long and have complex interactions with each other and their environments, forming intricate food webs. The study of animals is called zoology.Main article: Ecdysozoa Ecdysis: a dragonfly has emerged from its dry exuviae and is expanding its wings. Like other arthropods, its body is divided into segments. Animals found on Antarctica include penguins such as the emperor and chinstrap penguin; seals such as the crabeater and southern elephant seal; and seabirds such as the wandering albatross and kelp gull. Evolution and Development" (PDF). Carnegie Institution for Science Department of Embryology. 1 May 2012. p.38. Archived from the original (PDF) on 2 March 2014 . Retrieved 4 March 2018. 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] History of Falconry". The Falconry Centre. Archived from the original on 29 May 2016 . Retrieved 22 April 2016.

USDA. "U.S. Rabbit Industry profile" (PDF). Archived from the original (PDF) on 20 October 2013 . Retrieved 10 July 2013. Sluys, R. (1999). "Global diversity of land planarians (Platyhelminthes, Tricladida, Terricola): a new indicator-taxon in biodiversity and conservation studies". Biodiversity and Conservation. 8 (12): 1663–1681. doi: 10.1023/A:1008994925673. S2CID 38784755.a b c d Nicol, David (June 1969). "The Number of Living Species of Molluscs". Systematic Zoology. 18 (2): 251–254. doi: 10.2307/2412618. JSTOR 2412618. Find sources: "Lists of animals"– news · newspapers · books · scholar · JSTOR ( August 2022) ( Learn how and when to remove this template message) Allen, Larry Glen; Pondella, Daniel J.; Horn, Michael H. (2006). Ecology of marine fishes: California and adjacent waters. University of California Press. p.428. ISBN 978-0-520-24653-9.