You are looking at the HTML representation of the XML format.
HTML is good for debugging, but is unsuitable for application use.
Specify the format parameter to change the output format.
To see the non HTML representation of the XML format, set format=xml.
See the complete documentation, or API help for more information. 
<?xml version="1.0"?>
<api>
  <query>
    <pages>
      <page ns="0" title="Fowl Pox" missing="" />
      <page ns="0" title="Marek&#039;s Disease" missing="" />
      <page pageid="5" ns="0" title="Chicken Breeds" touched="2013-06-27T10:25:37Z" lastrevid="560" counter="29324" length="955" />
      <page pageid="6" ns="0" title="Chicken Breeds Chart" touched="2015-10-25T07:24:45Z" lastrevid="1055" counter="1532467" length="24118" />
      <page pageid="395" ns="0" title="Contact Backyard Poultry Administration" touched="2013-07-30T22:18:13Z" lastrevid="574" counter="27459" length="1858" />
      <page pageid="7" ns="0" title="Duck Breeds" touched="2014-11-11T06:36:31Z" lastrevid="566" counter="16072" length="480" />
      <page pageid="441" ns="0" title="Duck Breeds Chart" touched="2014-11-11T06:35:43Z" lastrevid="654" counter="17250" length="1250" />
      <page pageid="8" ns="0" title="Goose Breeds" touched="2013-07-07T11:13:42Z" lastrevid="564" counter="12991" length="274" />
      <page pageid="9" ns="0" title="Guinea Fowl" touched="2013-07-22T09:13:15Z" lastrevid="572" counter="39713" length="4234" />
      <page pageid="21" ns="0" title="Turkeys" touched="2013-06-12T09:14:55Z" lastrevid="68" counter="4510" length="172" new="" />
    </pages>
  </query>
</api>