From my observations of geckos in the wild and in captivity I would guess that they vocalize when there aren't any others around for a couple reasons. One, others might be around, that doesn't mean you can see them. That would probably be a territorial and/or mating type chirp. If others truly are not around, perhaps the gecko is trying to keep it that way (stake out territory), or trying to attract a mate(s).

I find that gex are truly fascinating with their communication behaviors. Tail motions and body orientations are other methods. One time I had U. lineatus next to U. phantasticus. The U. lineatus were definitely moving their tails while looking at the U. phantasticus. Really cool!

Then there are my favorite noisy maters, Oedura monilis! I truly feel sorry for these females. ;)

Julie Bergman
http://www.geckoranch.com
GGA lifetime member

J Thompson wrote:

Hi all,
I'm in Honduras right now and of course there are geckos around and in the houses here.  
Most of them are small, about 2-3" SV max, and I've seen several adorable itty bitty 
juveniles.  They are mostly brownish, a few whitish ones, and I'm guessing they are 
probably some Hemidactylus.  They are also quite vocal, and sound a little like the 
squirrels at home.

Now we've been pondering the function of the vocalizations, the main theory being that it is territorial, though I frequently hear one call that is not within line of sight of another gecko (unless they have much better long distance vision than I thought!), but maybe that's not important.

Last night I was watching a pair and a preying mantis hanging out around the porch light, which was swarmed with insects. I never got to see the gex eat, but the mantis was stuffing himself with easy pickings, and I considered that the gex hanging out around house lights are probably quite well fed! I kind of wondered if that gave them more free time for things like mating, and wondered if maybe the frequent calling was related to that.

So to make a long-winded question shorter, what do you think? What is the function of most vocalizations (I mean when a gecko is just hanging out, not responding to another gecko--male or female--or being handled, etc.)




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