howler monkey
Refers to the howler monkey, a type of New World monkey known for its loud vocalizations.
Howler monkeys inhabit the tropical rainforests of Central and South America.
In the morning, you can hear the howling of howler monkeys.
Katakana spelling is common for animal names; usually written in kana.
Kanji spelling using 吠 (bark/howl) and 猿 (monkey). Rarely used; the katakana form is standard.
Variant kanji spelling with 吼 (roar/howl). Even rarer than 吠猿.
Compound of 吠え (hoe, 'barking, howling') + 猿 (saru, 'monkey'). The katakana spelling ホエザル is standard for this animal name.