- Joined
- Apr 24, 2025
You got any info on Kiwi’s mating habits?
Kiwi are interesting because both males and females invest a ton into their offspring, but in different ways, and their offspring are superprecocial. Kiwi are also remarkably long-lived, with some living into their 60s. Males are (usually) territorial and establish ranges that they aggressively defend from other males. Females are larger and stronger than males and essentially have to lay on the ground to mate, so they could easily thwart any forced copulation attempts from a male. Kiwi courtship involves mutual chasing, vocalizations, and poking and rubbing with their beaks. Kiwi are almost entirely socially monogamous with a high degree of genetic monogamy, meaning most mate for life and form stable relationships with high fidelity.
(Some populations with high female-to-male ratios are an exception to this. They have a yearly divorce rate of about 50%, and males are not territorial. Divorce in these populations appears to be "forced divorce", that is, not instigated by either of the mated pair, but instigated by an unpaired female coming in and kicking out the resident female. Other kiwi populations have been observed with a third of the mating units being polygynous trios. These populations don't have a sex ratio bias, but they are found in colder climates that necessitate females help with incubation. Because of this, females aren't able to recover as quickly to lay another egg, so males benefit from having a second mate. Yet another population, that of Ponui Island, has a minority of polyandrous trios. The population has incredibly high density and nowhere to disperse, so it's believed some males tolerate being part of a trio, and the females gain a fitness advantage. All in all, kiwi appear to be monogamous by default but somewhat flexible depending on the environment, much like humans.)
Females gestate for an entire month and lay a huge egg 20% of their body weight. After that, the males do all or most of the incubating, which lasts up to three months. When the chick hatches, it is fully feathered and sighted and has a large yolk that feeds it for over two weeks. Parents don't typically brood or feed their young, although the young do stay within their parents' territory for a few weeks to a few years. During this time, parents and older siblings show them how to survive and provide protection from predators. (Speaking of predators, kiwi evolved defenses against predatory birds but not invasive mammals. Kiwi chicks are especially vulnerable, with 70% of them being killed by stoats and cats within their first six months. Only about 5% of kiwi chicks survive to adulthood.
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In conclusion, our mascot is very sweet and romantic

(Some populations with high female-to-male ratios are an exception to this. They have a yearly divorce rate of about 50%, and males are not territorial. Divorce in these populations appears to be "forced divorce", that is, not instigated by either of the mated pair, but instigated by an unpaired female coming in and kicking out the resident female. Other kiwi populations have been observed with a third of the mating units being polygynous trios. These populations don't have a sex ratio bias, but they are found in colder climates that necessitate females help with incubation. Because of this, females aren't able to recover as quickly to lay another egg, so males benefit from having a second mate. Yet another population, that of Ponui Island, has a minority of polyandrous trios. The population has incredibly high density and nowhere to disperse, so it's believed some males tolerate being part of a trio, and the females gain a fitness advantage. All in all, kiwi appear to be monogamous by default but somewhat flexible depending on the environment, much like humans.)
Females gestate for an entire month and lay a huge egg 20% of their body weight. After that, the males do all or most of the incubating, which lasts up to three months. When the chick hatches, it is fully feathered and sighted and has a large yolk that feeds it for over two weeks. Parents don't typically brood or feed their young, although the young do stay within their parents' territory for a few weeks to a few years. During this time, parents and older siblings show them how to survive and provide protection from predators. (Speaking of predators, kiwi evolved defenses against predatory birds but not invasive mammals. Kiwi chicks are especially vulnerable, with 70% of them being killed by stoats and cats within their first six months. Only about 5% of kiwi chicks survive to adulthood.

In conclusion, our mascot is very sweet and romantic

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