Movement of captive-released Orinoco crocodiles (Crocodylus intermedius) in the Capanaparo River, Venezuela

  • Published source details Muñoz M.D.C. & Thorbjarnarson J. (2000) Movement of captive-released Orinoco crocodiles (Crocodylus intermedius) in the Capanaparo River, Venezuela. Journal of Herpetology, 34, 397-403.


This study is summarised as evidence for the following.

Action Category

Head-start wild-caught reptiles for release: Crocodilians

Action Link
Reptile Conservation
  1. Head-start wild-caught reptiles for release: Crocodilians

    A study in 1991–1992 in a river near San Jose, southwestern Venezuela (Muñoz & Thorbjarnarson 2000) found that after releasing head-started Orinoco crocodiles Crocodylus intermedius, some survived at least a year. Seven crocodiles survived for at least 235–352 days, and one was killed accidentally two weeks following release. Crocodiles moved an average of 4–5 km/month (maximum distance 12 km). The average growth rate of released crocodiles (4 of 8 released individuals) was 0.1 cm/day, which was comparable to some smaller, wild-caught juveniles (0.1 cm/day) (result not statistically tested). In 1987, eggs were collected from along the river and hatched in captivity. Eight male crocodiles were head-started (length range from 115–139 cm) and released in March or April 1991. Crocodiles were fitted with radio transmitters and located every 1–2 days from April 1991 to March 1992.

    (Summarised by: Maggie Watson, William Morgan)

Output references
What Works 2021 cover

What Works in Conservation

What Works in Conservation provides expert assessments of the effectiveness of actions, based on summarised evidence, in synopses. Subjects covered so far include amphibians, birds, mammals, forests, peatland and control of freshwater invasive species. More are in progress.

More about What Works in Conservation

Download free PDF or purchase
The Conservation Evidence Journal

The Conservation Evidence Journal

An online, free to publish in, open-access journal publishing results from research and projects that test the effectiveness of conservation actions.

Read the latest volume: Volume 19

Go to the CE Journal

Discover more on our blog

Our blog contains the latest news and updates from the Conservation Evidence team, the Conservation Evidence Journal, and our global partners in evidence-based conservation.

Who uses Conservation Evidence?

Meet some of the evidence champions

Endangered Landscape Programme Red List Champion - Arc Kent Wildlife Trust The Rufford Foundation Save the Frogs - Ghana Bern wood Supporting Conservation Leaders National Biodiversity Network Sustainability Dashboard Frog Life The international journey of Conservation - Oryx British trust for ornithology Cool Farm Alliance UNEP AWFA Butterfly Conservation People trust for endangered species Vincet Wildlife Trust