specialized facial pits
...that pit vipers and some boas and pythons have specialized facial pits for sensing infrared radiation?
...that <a class="mw-redirect" href="./Crotalinae" id="mwE5s" rel="mw:WikiLink" title="Crotalinae">pit vipers</a> and some <a class="mw-disambig" href="./Boa" id="mwE5w" rel="mw:WikiLink" title="Boa">boas</a> and <a href="./Pythonidae" id="mwE50" rel="mw:WikiLink" title="Pythonidae">pythons</a> have <b id="mwE54"><a href="./Infrared_sensing_in_snakes" id="mwE58" rel="mw:WikiLink" title="Infrared sensing in snakes">specialized facial pits</a></b> for sensing <a class="mw-redirect" href="./Infrared_radiation" id="mwE6A" rel="mw:WikiLink" title="Infrared radiation">infrared radiation</a>?