The picture below comes from an interesting article on a case of mutalism between pitcher plants and bats.
Service benefit provided by N. r. elongata to K. h. hardwickii. (a) Aerial pitcher of N. rafflesiana var. elongata. (b) The same pitcher with the front tissue removed to reveal a roosting Hardwick’s woolly bat. (c) The shorter aerial pitcher of N. rafflesiana variety typica.
The original picture and the article it comes from can be found here.