Day 153: It happens! Gila monster hatching success!


So, almost after all hope was lost on Day 153 the first Gila monster egg pipped from its leathery shell! Egg 02 at first cut a small slit and then a few more and over the next two days began to emerge from the egg. At first the baby Gila stuck its nose out, then it’s head, then half its body, and finally the entire body. It appears that hatching is a labor-intensive process as there are long pauses between progressive stages and also seems to be a good way of ensuring all the contents of the egg are consumed before leaving the egg. Over the ensuing days this process was (and currently is for two more lizards) repeated over and over, with Gilas emerging from their shell about two or so full days from pip to full emergence. Once the contents are completely devoured the neonate Gila monster leaves its shell and begins to wander the egg box. I witnessed one Gila that was out actually eating the egg yolk of another just coming out of its shell! Greedy bastard.

Once fully emerged and climbing around, the little monsters are pulled from the egg box, photographed, weighed, and set up solo in an 18 quart Sterelite box with paper towels as bedding and small water dish. The paper towel bedding serves as a clean substrate while the umbilical wound heals and the first few meals are eaten and passed through to make sure everything is going well. I will attempt the first feeding next week after the yolk has been fully digested and look forward to raising the babies from there!

I will be posting updates on the neonates growth, as well as some thoughts and insights on my first season captive breeding Gila monsters. Some reviews of the equipment I used is also likely in order as these items played an important role in my success. Whew, what an amazing season! The process has been fun, though frustrating and worrisome at times, and I look forward to greater success next year with these amazing reptiles!

Day 152: A watched egg never hatches

A Gila monster near hatch datePatience. Patience is what those in the know say. Sure, I am checking the incubator at least ten times a day for any action and patience is not my virtue, but I am old enough to know when to listen. A couple a the eggs dented in over two weeks ago, the two others are starting to dimple (not dent) and in all honesty I would be surprised if any of them hatch at this point. If they do not hatch my biggest concern is figuring out where my failure was. Is it the incubator? No, the Grumbach’s are renowned for their reliability. Is it the S.I.M. egg container? No, these have been used successfully with Gila monsters before. My temperature, though low, should not be the issue and my humidity is spot on, so it shouldn’t be that. We just started having cold fronts move through and temps have fallen so that may have a slight play into it (I have ordered a space heater to remedy this issue). At this point my guess is that since the fan in the Grumbach is unplugged that there may not be enough airflow which may be an issue, or the fact that the Pangea Hatch medium has started to grow mold adds to this theory. I do open the incubator to allow fresh air to enter but it may not be enough. Whatever the case, I will hold on hope until the last egg turns yellow and starts to sweat. If they all die I will carefully review my protocols and notes and seek the advise of successful breeders to plan for a better year next season!

On another note, I have stopped feeding my adults and am turning off the lights and under-cage heating in preparation of hibernation, which will begin after Thanksgiving. I have an old refrigerator that is hooked up to a Ranco thermostat for the cool down. Would be great if I could cool them in their cages but we do not see steady enough low temps here in northern Florida to ensure the Gila will reach and stay at 53°F for the three months of brumation.

Day 132: So close, but so far!

R0000020We are 132 days past oviposition and the remaining six eggs appear to be hanging in there. One of the eggs has dented in, which I am hoping means that it will hatch in the next few weeks and does not mean the embryo has died. The other eggs remain rigid and appear to be well, fingers crossed they come to term! The Grumbach has been great in maintaining the temperature and humidity stable throughout incubation, but I have noticed that the egg boxes have increased in temperature by 1°F higher than the incubator over the last few weeks. Condensation has also started to build up (mostly on the sides) so I’ve been keeping an eye on that to ensure none falls on the eggs potentially suffocating the embryo inside. Since the eggs were incubated at the lower end of the range it can be expected that the eggs will hatch (if they do) toward the later end of the spectrum, potentially 150+ days. Man, I can’t wait…

On the other side of the house my adult Gilas are getting ready for next year. Weekly feedings of 2-3 mice (2 for the males, 3 for the females) has brought all of the Gilas to a healthy state; good fat reserves in the tails and a constant, though not concerning, weight gain. As most of my group was purchased earlier in 2019 and after the hibernation cycle, I do not have data on what the pre-hibernation weights were last year but I think they are ahead as their weights are above pre-breeding numbers from this season. I hope to have more fertile eggs that make it to term in the upcoming season as they entire group will have been with me for the whole cycle.

Winter cooling is going to start in late November and this year a larger refrigerator / cooler is going to be purchased in order to facilitate all adults. I’ve noticed an increase in activity and feeding response in the adults over the past week, almost being as active as breeding season. I do not know if this has to do with growing follicles and testes, a reduced photoperiod, or slight drop in temperature (or maybe all) but it does seem that the Gilas are getting ready for a long winter’s nap!

That’s all for now, hopefully the next post is of the Gilas hatching!!