recursive template problem

I have the xml and xsl below and the result when transformed that I'm trying to get is the following order of species. Is this even possible through xslt? I don't know if I'm approaching this the right way with a recursive template, I cannot find a way to pass the value of from of call of the template to the next. Any help or tips would be appreciated.

Order of: human
Order of: human, ape
Order of: human, ape, monkey


<?xml version="1.0" encoding = "ISO-8859-1"?>
<?xml-stylesheet type = "text/xsl" href="transform.xsl"?>
<species>
<animal name = "lizzard" order = "reptile" id = "1"></animal>
<animal name = "monkey" order = "primate" id = "2"></animal>
<animal name = "ape" order = "primate" id = "3"></animal>
<animal name = "human" order = "primate" id = "4"></animal>
<animal name = "crockadile" order = "reptile" id = "5"></animal>
</species>



<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">

<xsl:variable name = "limit" select = "count(species/animal[@order='primate'])" />
<xsl:variable name = "order-of" select = "'Order of: '" />

<xsl:template match = "species/animal" name = "printorder">
<xslaram name = "header" select = "$order-of" />
<xslaram name = "count" select = "0" />
<xsl:if test = "@order = 'primate'">
<xsl:for-each select = "@name">

<xsl:variable name = "nextname" select = "." />
<xsl:variable name = "newtext" select = "concat($header,$nextname)" />
<xsl:value-of select = "$newtext" /> <br />
<xsl:if test = "$count <= $limit">

<xsl:call-template name = "printorder" >
<xsl:with-param name = "header" select = "$newtext" />
<xsl:with-param name = "count" select = "$count + 1" />
</xsl:call-template>
</xsl:if>


</xsl:for-each>