Documents in this web site:


   Iguana research. 1

Anaconda research. 1

Crocodilian research. 1

Conservation. 1

Other Publications. 1

Opinion essays. 1


Iguana research

Sex differential antipredator behavior in juvenile green iguanas, Iguana iguana: evidences for fraternal care.

A non-flushing stomach wash technique for large lizards.

Differential behavior in both sexes of green iguana (Iguana iguana).

Juveniles Iguana iguana (Green iguana): predation.

Sex identification in Juvenile green iguanas (Iguana iguana) by cloacal analysis .

Sex differential antipredator behavior in juvenile green iguanas, Iguana iguana: evidences for fraternal care.

Ctenosaura similis (Spiny-tailed iguana): tick infestation.

Anaconda research

Eunectes murinus (green anaconda): Subduing behavior.

A safe method for handling large snakes in the field

Eunectes murinus: caiman predation.

Eunectes murinus (green anaconda): cannibalism.

Predatory attack of a green anaconda (Eunectes murinus) on an adult human.

Applicability of Force feeding transmitters to study reproductive biology of large snakes.

Eunectes murinus: Juvenile predation

What is the length of a snake?

Sexual size dimorphism in snakes: wearing the snake’ s shoes  (PDF file)

Infectious Disease serologic survey in free-ranging Venezuelan anacondas (Eunectes murinus).

 Crocodilian research

Crocodylus intermedius (Orinoco crocodile): age at first reproduction Herpetological Review.

Paleosuchus trigonatus (Dwarf Caiman) Neonate time budget.  Herpetological Review

Paleosuchus trigonatus (Schneider’s Smooth-fronted Caiman): Nesting and hatching Herpetological Review. 32: 251.    (PDF file)


La conservación ambiental en el socialismo del siglo XXI:  ensayo para un manifiesto conservacionista.  Encontrarte. 55: 1-20.

Conservation of Anacondas: How Tylenol conservation and macroeconomics threaten the Survival of the world's largest snake.

Conservation in democracies: The role of advocacy

Teaching conservation effectively: a lesson from life history strategies.
The miracle of universities.


Other Publications

 Snake mating systems, behavior, and evolution: The revisionary implications of recent findings.

-The llanos.


 sulphureus (Amazon Puffing Snake): Diet Herpetological Review. Herpetological Review. 34 (1): 72

-Crotalomorphism: A Metaphor to Understand Anthropomorphism by Omission

-Killer Bees? Run and Shut Up!!

Opinion essays


Rivas, J. A.  2008 Displacement Behavior and Stockholm Syndrome in the US "LEFT": Why They Can't Get Their Heads Around the Bolivarian Revolution.  The Axis of Logic January. 


Rivas, J. A., 2007, What is the path to Socialism Revolution or Evolution?: The Axis of Logic, v. July


Rivas, J. A., 2007, Environmental Conservation and Socialism. A Conservationist Manifesto for the Venezuela's revolution: The Axis of Logic, v. July 


Rivas, J. A., 2007, What is wrong with Pain Killers, NPR, the Democractic Party and Conservation Biologists?: The Axis of Logic, v. October


Rivas, J. A. (2007). "The immigration problem: What problem? Whose problem?" The Axis of Logic August


Rivas, J. A., 2006, Understanding the minds of the neocons: Oil wars,  attacks on the Venezuelan revolution and the corruption of US democracy: Vheadlines, v. Available at


Rivas, J. A. 2005.  Comparing Ecuador and Venezuela: Similar Opposition, Very Different Governments.  Venezuelanalysis April available at

Curriculum vitae


         Life history of the green anaconda
         The Land of the Anaconda