Cartoon reasoning about dinosaurs 
In a recent XKCD cartoon (which I've also embedded below), Randall Munroe juxtaposes two claims:

1. "By any reasonable definition, T. Rex is more closely related to sparrows than to Stegosaurus."

2. "Birds aren't descended from dinosaurs, they are dinosaurs."

As far as I know, claim 1 represents what is true of the phylogeny. The picture below the claim nicely illustrates some of the reasoning for it.

The cartoon suggests without quite saying that claim 1 is a reason to accept claim 2. But I just don't see how the inference is supposed to work. Moreover, claim 2 is basically false.
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