These researchers observed that howler monkeys
with large hyoid bones in their voice boxes produced loud, low-pitched calls that help to make them seem larger, and therefore more attractive to females.
All aboard to enjoy the wildlife on a river trip from Los Chiles - sightings could include, from top right, noisy howler monkeys
, a vivid emerald basilisk or even a menacing river predator, the caiman
While studying primates in Mexico, Dunn heard drastic differences between resident howler monkeys
Around 87,000 species -- an estimated 6 percent of all known species -- live there, including howler monkeys
, pumas and toucans.
EXTENSION OF THE CONTACT ZONE AND PROBABLE HYBRIDIZATION BETWEEN BROWN HOWLER MONKEYS
(Alouatta guariba clamitans) AND BLACK-AND-GOLD HOWLER MONKEYS
(Alouatta caraya) (PRIMATES, ATELIDAE) IN SOUTHERN BRAZIL
Our first stop was Esmeralda Lodge - three wooden cabins tucked away in the jungle, where you fall asleep to the sound of frogs and wake to the bellow of howler monkeys
before birdsong signals breakfast.
Only Brazil's Pantanal region - where the wildlife includes giant otters, howler monkeys
, giant anteaters, capybara, caiman, tapir, toucans and hyacinth macaws - was said to be better for nature encounters in October.
The sporadic emergence of YFV in the Americas has been strongly associated with infection of red howler monkeys
(Alouatta seniculus), which are particularly susceptible to disease.
The other characters from the animal kingdom that Ribbit encounters in his search for his princess include ocelot cubs, howler monkeys
, a alligator and a pair of manatees.
Genetic evidence on the historical biogeography of Central American howler monkeys
In this episode we also meet the most colourful primates, the mandrills, black howler monkeys
, who are the loudest, and gangs of rhesus macaques, who are the most likely to ransack your home.
Larger animals including Howler monkeys
and Woolly Spider monkeys preferred leaves and foliage.
Or, for the more adventurous, one of Chabil Mar's signature tours is always available - a private freshwater excursion past the fishing village of Monkey River to see howler monkeys
The peaks of the limestone structures pierce the dense, green canopy of the jungle and howler monkeys
wail at sunrise.
Now a University of Michigan-led study of interbreeding between two species of modern-day howler monkeys
in Mexico is shedding light on why it's so difficult to confirm instances of hybridization among primates -- including early humans -- by relying on fossil remains.