When howler monkeys wake you up... 5 o'clock in the morning, you know you're in the rainforest! Mantled howler monkeys (allouata palliata) are one of the 4 species of monkeys that you will be able to see in the Osa Peninsula. Howlers differ from the other 3 species (and all arboreal mammals except sloths) in feeding heavily on leaves. This low-energy diet makes howler monkeys more lethargic than their cousins. They spend as much as three quarters of the day and all night resting or asleep. However when it comes to rise early, things are different. At El Remanso, howler monkeys are our official alarm clocks, no wonder, because their calls can be heard from several kilometers away. They are actually the loudest of all New World monkeys. The reason for this is that their hyoid bone, which is situated next to the vocal chords and serves as an amplification chamber, is 25 times (!) larger than that of similar-sized monkeys. The result is a deep, grunt-like call which are used to mark territory and communicate with others within the troop. This morning, after an intense rain throughout the night, a troop of howlers came to visit us in front of the El Remanso restaurant and offered us great photo opportunities, enjoy the pictures! [caption id="attachment_491" align="aligncenter" width="450" caption="Mum howler enjoying some fresh cecropia leaves"][/caption] [caption id="attachment_492" align="aligncenter" width="450" caption="The troop of howler monkeys in front of our restaurant"][/caption] [caption id="attachment_493" align="aligncenter" width="450" caption="Howlers are mainly herbivores"][/caption] [caption id="attachment_494" align="aligncenter" width="450" caption="Baby howler is hungry too!"][/caption] [caption id="attachment_495" align="aligncenter" width="450" caption="Sleeping three quarters of the day...not bad!"][/caption] [caption id="attachment_496" align="aligncenter" width="450" caption="It's always about choosing the fresh leaves..."][/caption] [caption id="attachment_497" align="aligncenter" width="320" caption="The howlers came to a cecropia tree in front of our restaurant"][/caption] [caption id="attachment_498" align="aligncenter" width="480" caption="Not a bad view at while eating!!"][/caption] [caption id="attachment_500" align="aligncenter" width="450" caption="The group spent over an hour in front of the mirador of the restaurant."][/caption]