Update mammal info pane

Author: adriankgeorge

index_mammal.html

@@ -67,7 +67,9 @@ <h1>Acknowledgements</h1>
                    and its constituent databases: FAUNMAP, the North American Pollen Database, the European Pollen Database and Alpine Pollen Database, and the Indo-Pacific Pollen Database. The work of data contributors, data stewards,
                    and the Neotoma community is gratefully acknowledged. Ice sheet data is from Dalton et al (2020) and Hughes et al (2016) - see full citations below.
 
-                  This work would not have been possible without funding support from NSF (Grant EAR-1550707), the University of Wisconsin–Madison Graduate School, and the Minnie Riess Detling Trust.</p>
+                  <b>Symbol Legend:</b> The small, hollow circles represent samples dated after the timestamp of the animation, the large filled circles represent samples dated at the timestamp, the small, filled circles represent samples dated prior to the timestamp. 
+
+                   This work would not have been possible without funding support from NSF (Grant EAR-1550707), the University of Wisconsin–Madison Graduate School, and the Minnie Riess Detling Trust.</p>
                   <p><b>Code Source:</b> To view our code and make your own maps using data from the Neotoma Paleoecology Database, visit our <a href="https://github.com/NeotomaDB/RangeMapper">GitHub repository</a>. </p>
                   <p><b>Citation:</b> George, A.K., Roth, R.E., Widell, S., and Williams, J.W.. (in revision). Range Mapper: An Adaptable Process for Making and Using Interactive, Animated Web Maps of Late-Quaternary Open Paleoecological Data. Open Quaternary.</p>