Reproduction
One of the most interesting facts about
Tachyglossus aculeatus is that they lay eggs (Rismiller and
McKelvey 2003). This,
however, is just one of many aspects that
sets T. aculeatus apart from most other mammals. For these
mammals, there is one breeding period per year, and it takes
place between June and August. During this period, females only
mate one time or not at all. Female T. aculeatus do not mate
every year; in fact, the years that they mate completely depends
on the individual (Rismiller and McKelvey 2000). This is unlike
most other mammals.
Tachyglossus aculeatus’ genetalia are also unique. Both the
male and female have internal genetalia, but the male’s
reproductive organs are especially different (Rismiller and
McKelvey 2000). T. aculeatus only use their penises as a
passageway for semen. Their penises are very distinctive,
because they are bifid. Not only are they bifid, each half has
two rosettes. Thus, their penis has four heads with one shaft.
Each of the heads or rosettes have openings that are similar to
a showerheads. Although T. aculeatus have penises with four
heads, they only use two heads or one bifid at a time. They
alternate which side they use each ejaculation (Johnston et al.
2007).
Tachyglossus aculeatus become sexually mature around the age
of two or three. They are considered mature after they take part
in a courtship train, which consists of one female along with
one or more males (Rismiller and McKelvey 2003). In order to
start the reproduction process, females let off a scent that
attracts males (Rismiller and Seymour 1991). As a part of the
courtship train, males dig a circle around the female
T.
aculeatus, which leads to competition between males. After one
male beats out the rest, which can take seven to thirty-seven
days, he uses his paw to lift up her tail (Rismiller and
McKelvey 2003; Rismiller and McKelvey 2000). Then they pair up
and sexually reproduce for thirty to one hundred and eighty
minutes (Rismiller and McKelvey 2000). To learn about the growth
of the young, go to Life History.
Females successfully produce an egg their first time reproducing, while males do not typically successfully reproduce their first time (Rismiller and McKelvey 2003). The female produces one fertile egg after twenty-three days. At that time, she puts the egg inside her pouch, where later hatches (Rismiller and McKelvey 2000). To learn more about reproduction habits, go to the Animal Diversity Web.
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