Aguiguan Reed Warbler vs Coimbra-Filho’s Titi

Acrocephalus nijoi compared with Callicebus coimbrai

Key Differences

• Aguiguan Reed Warbler is Extinct while Coimbra-Filho’s Titi is Endangered.

Taxonomic Classification

Rank	Aguiguan Reed Warbler	Coimbra-Filho’s Titi
Kingdom same	Animalia (動物)	Animalia (動物)
Phylum same	Chordata (脊索動物)	Chordata (脊索動物)
Class	Aves (鳥類)	Mammalia (哺乳類)
Order	Passeriformes (スズメ目)	Primates (サル目)
Family	Acrocephalidae	Pitheciidae
Genus	Acrocephalus	Callicebus
Species	Acrocephalus nijoi	Callicebus coimbrai

Evolutionary Relationship

Aguiguan Reed Warbler and Coimbra-Filho’s Titi share a common ancestor at the Phylum level: Chordata. (脊索動物)

Conservation Status

Aguiguan Reed Warbler

EX — Extinct

Coimbra-Filho’s Titi

EN — Endangered

Physical Characteristics

Attribute	Aguiguan Reed Warbler	Coimbra-Filho’s Titi
Diet	—	—
Average Lifespan	—	—
Average Length	—	—
Average Weight	—	—

Habitat & Geographic Range

Aguiguan Reed Warbler

Habitat

Typically found in various aerial, terrestrial, and aquatic environments.

Range

Found in Norway.

Coimbra-Filho’s Titi

Habitat

Typically found in diverse terrestrial and aquatic ecosystems.

Aguiguan Reed Warbler

The Aguiguan Reed Warbler (Acrocephalus nijoi) is a species in the genus Acrocephalus. It is currently classified as Extinct on the IUCN Red List. Typically found in various aerial, terrestrial, and aquatic environments.

Coimbra-Filho’s Titi

The Coimbra-Filho's Titi (Callicebus coimbrai), also known as Coimbra-Filho's Titi Monkey, is a small New World monkey in the family Pitheciidae, named in honour of the Brazilian primatologist Adelmar F. Coimbra-Filho. This titi monkey is endemic to the Atlantic Forest of northeastern Brazil, with its range restricted to the states of Sergipe and southern Alagoas—one of the most critically fragmented and threatened biomes on Earth. Adults are small, with reddish-brown fur on the flanks and upperparts, pale grey on the underparts, and an orange-red forehead band. Like all titi monkeys, Callicebus coimbrai is highly social, living in monogamous family groups of 2–5 individuals that engage in elaborate dawn duets and tail-twining behaviour as expressions of pair bonding. The species inhabits Atlantic Forest fragments, including lowland and highland forest patches, riverine gallery forest, and secondary growth, where it subsists on fruits, seeds, leaves, and occasional invertebrates. The Coimbra-Filho's Titi is classified as Endangered by the IUCN due to its severely fragmented range within one of the world's most deforested biomes, with less than 12% of original Atlantic Forest remaining, ongoing habitat loss from agricultural expansion, and small, isolated population sizes highly vulnerable to stochastic extinction events.