As a result of their anatomical modifications, howler monkeys
produce exceptionally low-frequency vocalizations for their body size compared with other mammals,' the researchers wrote.
Caption: In nine species of howler monkey
, researchers found an inverse relationship between testes size and size of the hyoid bone, part of the vocal tract.
Heterospecific groups of howler monkeys
were detected at Estancia Defesa (29[degrees] 49'04.
We also went on a boat tour through Tortuguero National Park with Gerardo and his father, who had a talent for spotting sloths in the highest trees, crocodiles and caimans, howler monkeys
, lizards on branches and birds including grebes, cormorants, snowy egrets, toucans and impressive bluethroated herons.
Yellow fever virus strains sequenced in the study and their metadata, Venezuela * Isolate ID Source Location 1A Red howler monkey
Monagas 2A ([dagger]) Red howler monkey
Guarico 3A Red howler monkey
Portuguesa 4A Red howler monkey
Portuguesa 5A Human Portuguesa 6A ([dagger]) Human Portuguesa 7A Human Portuguesa 8A ([dagger]) Red howler monkey
Barinas 9A ([dagger]) Red howler monkey
Apure 10A ([dagger]) Red howler monkey
Monagas Isolate ID Year of Passage GenBank collection history accession no.
Survey and census of howler monkeys
(Alouatta palliata) in the rain forest of "Los Tuxtlas," Veracruz, Mexico.
The two primate species in the study, mantled howler monkeys
and black howler monkeys
, diverged about 3 million years ago and differ in many respects, including behavior, appearance and the number of chromosomes they possess.
Almost immediately, the somewhat alarming cries of a troop of howler monkeys
erupt above our heads and soon their sxpressive faces can be seen peering down at us from within the canopy.
We jumped in a canoe and crossed, then headed into the jungle on foot while howler monkeys
bellowed in the treetops above us.
Annotations on the feeding ecology of black howler monkeys
in an overcrowded fragment in Balancan, Tabasco, Mexico
We wanted to wake up early, and did, to the haunting sound of howler monkeys
hooting in the wee-dawn hours.
Most mornings we woke to the roar of howler monkeys
in the humid jungle on our side of the river.