This is the trail leading down to the Oilbird grotto.
The trail is dark, wet & slimey and being less disturbed than the other trails there is often a (very poisonous) Fer de Lance on the path. This area is good for Antbirds -particularly the Black-faced Ant-thrush as well as uncommon Furnariids such as Streaked Xenops & Grey-throated Leaftosser.