bird control spikes
...that despite using sharp needles, bird control spikes do not harm the animals, and are recommended by the Royal Society for the Protection of Birds?
...that despite using sharp <a class="mw-disambig" href="./Needle" id="mwlg" rel="mw:WikiLink" title="Needle">needles</a>, <b id="mwlw"><a href="./Bird_control_spike" id="mwmA" rel="mw:WikiLink" title="Bird control spike">bird control spikes</a></b> do not harm the animals, and are recommended by the <a href="./Royal_Society_for_the_Protection_of_Birds" id="mwmQ" rel="mw:WikiLink" title="Royal Society for the Protection of Birds">Royal Society for the Protection of Birds</a>?