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Wiki Education Foundation-supported course assignment

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This article was the subject of a Wiki Education Foundation-supported course assignment, between 18 March 2019 and 10 May 2019. Further details are available on the course page. Student editor(s): Adam Kimble.

Above undated message substituted from Template:Dashboard.wikiedu.org assignment by PrimeBOT (talk) 05:12, 17 January 2022 (UTC)[reply]

Male die off

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So did all the males die off? —Preceding unsigned comment added by 75.73.70.113 (talk) 07:21, 24 January 2009 (UTC)[reply]

A variety of mechanisims are used by different animals to determine sex. For example, mammals have the Y chromosome, crocodillians determine sex by the temperature the eggs are before hatching.  —Preceding unsigned comment added by 70.31.37.15 (talk) 05:24, 10 December 2010 (UTC)[reply] 

White throat; Six stripes

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I'm holding one of these guys (well, gals) and she has white underbelly and white throat. The article suggests a blue or blue-green colored throat. She also has only six stripes, with a seventh short stripe from its head to base of the neck. The two lowest stripes, on either side her belly, are white and the rest yellow to dark yellow. Socorro, NM. --67.0.220.62 (talk) 14:58, 11 April 2015 (UTC)[reply]

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Since when are hybrids considered a species?

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With their own species name and everything. Are ligers going to get their own species name? Felis ligris or something? — Preceding unsigned comment added by 75.72.204.139 (talk) 20:23, 2 November 2017 (UTC)[reply]

They are considered it when they are dominant in the wild. Regression is WAY more common in evolution than is often recognised through just looking at at the morphology of ancestral specimens. Modern humans are a hybrid of Archaic humans, Denisovans, and Neanderthals, and basically all cultivated fruits are hybrids. There are ring-species such as Californian Salamanders where the gestalt population is a genetic gradient, but populations at either end are differentiated enough to not be able to interbreed.
'Species' is a socially-constructed concept. It has near-objective delineations within it, but those delineations are gradiated with far more ambiguous, almost arbitrary, divides. These days, what is broadly preferred is the Phylogenetic (as opposed to biological) species concept that incorporates that ambiguity, postulating that a species is a population with a single common ancestor and defined synapomorphic traits.
Under such a purview, 'Ligers' are not a species because all Ligers do not share a common ancestor, at least not one they also share with lions and tigers. However, if you got enough ligers in a single population, then after a while, they would coalesce into a single lineage-group, becoming a 'species'. These whiptail lizards, alike, have distinct derived traits (of being parthenogenic), and a common ancestor of an asexual great-great-so-one-grandmother. 129.12.195.23 (talk) 14:05, 2 February 2023 (UTC)[reply]