github.io/terra/reference/headtail.html" class="external-link">head</a></span><span class="op">(</span><span class="va">DataSpecies</span><span class="op">)</span></span>
<span></span>
<span><span class="co"># Select the name of the studied species</span></span>
<span><span class="va">myRespName</span> <span class="op">&lt;-</span> <span class="st">'GuloGulo'</span></span>
<span></span>
<span><span class="co"># Get corresponding presence/absence data</span></span>
<span><span class="va">myResp</span> <span 