--- title: "Ringed Caecilian (Siphonops annulatus) | AnimalTracks.wiki" description: "A legless burrower about 40 cm long whose newborns eat their mother's skin and drink milk from her vent." image: "https://animaltracks.wiki/images/animals/ringed-caecilian-1.webp" published: "2026-10-11" updated: "2026-10-11" --- # Ringed Caecilian (*Siphonops annulatus*) > **Status**: Checked against 7 sources, listed under Sources below. > **Tagline**: A legless burrower about 40 cm long whose newborns eat their mother's skin and drink milk from her vent. > **Soundtrack Vibe**: Trip-Hop & Eerie Downtempo // Portishead, "Roads" > **Soundtrack Links**: [Spotify](https://open.spotify.com/track/2sW8fmnISifQTRgnRrQTYW) > **Vibe Match**: The ringed caecilian forces its way through soil head first, using a funnel-shaped head as a digging tool. Roads moves at a slow, heavy pace on a low bass line and a dragging drum loop, with a wavering voice drifting over the top. ## Biological Superpowers & Stats - **Taxonomy**: *Siphonops annulatus* - **Danger Level**: Low - **Conservation Status**: Least Concern ([IUCN Red List](https://doi.org/10.2305/iucn.uk.2023-1.rlts.t59593a180649042.en)) - **Superpower**: Mothers feed hatchlings with their own skin and a lipid-rich milk released from the vent - **Habitat**: Moist soil and leaf litter across South America east of the Andes - **Diet**: Earthworms and ground meat, as fed in captivity - **Tags**: amphibian, burrower, fossorial, subterranean, rainforest, bizarre-anatomy ## Natural History & Behavior ## Dinner is mom A ringed caecilian's babies dine on their mother. The hatchlings are altricial, meaning helpless at birth, and they feed on her specially modified skin. Biologists call this maternal dermatophagy, which just means skin eating by offspring. Both sides are specialised: the mother's skin changes, and the hatchlings carry "fetal" teeth in three rows on the lower jaw. Researchers think this kind of skin feeding has probably persisted in several caecilian lineages for more than 100 million years. > **Milk from an egg-layer** > For about two months the young drink milk that the mother lets out through her vent, the opening at the rear of the body, apparently prompted by the babies touching her and making sounds. The milk is mostly lipids and carbohydrates. In the studied population, pairs mate from late August to early October, and females lay eggs in November and December, at the peak of the rains. They hatch around the turn of the year. From laying to independent young, the mother's care lasts about three months. ## A living drill Eight adults collected in Bahia, Brazil measured 375 to 452 millimetres, averaging 410. A species description gives a body 17 to 26 times longer than wide, with 78 to 98 ring-shaped grooves called annuli. It lives underground, and its funnel-shaped head forces a way through the soil. In the head region, enlarged mucous glands, which make slippery goo, sit inside honeycomb walls of collagen, and that collagen anchors the skin into tiny pits in the skull bones. The authors suggest the glands, together with the head's shape, lubricate the body and help it push into soil. Its tunnels are always coated in a shiny, slippery film. ## Poison and a huge range The poison is packed into the rear end. Near the vent the poison glands are much enlarged, about 2.2 millimetres tall, and fill practically the whole dermis, the skin layer under the surface. The blunt rear end may serve in chemical defence, or by blocking a tunnel against invaders. Earlier experiments showed the skin secretions, from the head and from the rear, were toxic to a toad, a frog, a rat and even the caecilian itself. A 2011 taxonomic study called it the caecilian with the largest reported distribution: South America east of the Andes. In Brazil it turns up in the Caatinga, Atlantic forest, Cerrado and Amazonia. Its moisture needs are lower than those of many other caecilians, and it has been found under rotting oil palm trunks even in grazed pastures. In captivity, researchers fed it weekly on earthworms and ground beef or chicken. The IUCN Red List rates it Least Concern. ## Frequently Asked Questions ### Do baby caecilians really drink milk? Ringed caecilian babies do. Mothers of this egg-laying amphibian release a fatty milk through the vent for about two months, and the hatchlings swallow it. The milk is mostly lipids and carbohydrates and comes from enlarged glands lining the mother's oviduct, the tube eggs travel down. *(Source: [Mailho-Fontana et al. 2024]())* ### How long is a ringed caecilian? Eight adults collected in Bahia, Brazil ranged from 375 to 452 mm and averaged 410 mm. *(Source: [Jared et al. 2018]())* ### How many rings does a ringed caecilian have? Between 78 and 98, by one species description's count. The ring-shaped grooves wrap right around the body, except for three or four near the vent. *(Source: [Biodiversity Literature Repository, Plazi]())* ## Sources 1. [Siphonops annulatus. The IUCN Red List of Threatened Species 2023: e.T59593A180649042.]() 2. [Wilkinson et al. (2008). One hundred million years of skin feeding? Extended parental care in a Neotropical caecilian (Amphibia: Gymnophiona). Biology Letters.]() 3. [Mailho-Fontana et al. (2024). Milk provisioning in oviparous caecilian amphibians. Science.]() 4. [Jared et al. (2018). Life history and reproduction of the neotropical caecilian Siphonops annulatus (Amphibia, Gymnophiona, Siphonopidae), with special emphasis on parental care. Acta Zoologica.]() 5. [Jared et al. (2018). Skin gland concentrations adapted to different evolutionary pressures in the head and posterior regions of the caecilian Siphonops annulatus. Scientific Reports.]() 6. [Mauricio et al. (2021). Morphology of the Cutaneous Poison and Mucous Glands in Amphibians with Particular Emphasis on Caecilians (Siphonops annulatus). Toxins.]() 7. [Siphonops annulatus Mikan 1820 (taxonomic treatment from Maciel and Hoogmoed 2011, Zootaxa 2984). Biodiversity Literature Repository, Plazi.]() *Published October 11, 2026. 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