Gender differences

There are some obvious external differences between male and female boas. Thus, females compared with males of the same subspecies or local forms of the same age usually larger and heavier. In addition, males are usually more clearly pronounced after spurs than females. However, this is a rather insecure feature for accurate sex determination. Many a "couple asked" but ultimately as a female duo out with varying after spurs. Many purebred animals is this characteristic, but a good guide, however, is determined to ensure only in adult animals.
Additionally, you can view the cloacal region of the animals from the side (lateral). Females have a relatively shorter tail, and you can see from the cloaca a significant offset. In male Boas, the tail tapers behind the cloaca far less suddenly, there are at this point, the two Hemipenses in their pockets. This feature is of course only relatively safe if you have a direct comparison.
The sex of young boas can be He felt. Carry it the thumbs gently caudally from the cloaca. In male animals feel the two hemipenes under the skin. This method is quite safe as you feel anything in females, but should be carried out very carefully!
A secure and safe for the animal sex determination with this method is only possible in young boas. The previously commonly used sex determination by the Herausmassieren the hemipenes ("popping") should be avoided if possible, as it means a lot of stress for the animal and can lead to infections. "Popping" should, if at all, only be performed by an experienced operator.

 
The most common boas are probed for sex determination. The probing of snakes is a relatively safe method to determine the gender. Here too, however, the greatest caution is needed because a too briskly guided probe may lead to injury and, subsequently, for example, male sterility Boas!
The probing is based on the different depths of the Hemiclitoris bags of the female and the male Hemipenestaschen.
The probe is at the rear edge of the cloaca introduced towards the tail end, after it was first made slippery by means of physiological saline solution or Vaseline. Of course, they must be held largely sterile. The penetration depth is counted based on the ventral tail scales (subcaudale scales). In females, the probe penetrates only a few shed a deep, whereas it can be seen in male boas advanced very far in the deep Hemipenestaschen. Ross & Marcek (1994) published the following exploratory values (number of subcaudalen tail scales, to be introduced to the probe) of various subtypes Boa:
 
Bc amarali (M 9, W 3-4)
Bc constrictor (M 10-12, W 2-3)
Bc imperator (M 10, W 3-4),
Bc occidentalis (M 10-11, W 9-3),
Bc orophias (M 10-12, W 2-4)
Bc ortonii (M 10-12, W 4)
 
The penetration depth for other subspecies and "Mixed-Boaz" is also in this area, so that individual animals can be determined for certain, with the values for males and females never overlap. Errors occur only when the probe is not complete in the Hemipenis ~ ash is introduced weil. cramp the male.