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16 votes

Are there examples of animals being sexually attracted to another species more than to their own?

Here are a few examples. All are open to debate as to whether it answers your question. Zoophilia in humans When asking of example of a "species" that does something, it is easy to forget about the ...
Remi.b's user avatar
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7 votes
Accepted

Is a female spider, well-fed by sexual cannibalism, less likely to mate again?

It does appear that Wikipedia has not provided the most appropriate reference for that statement, but it is repeated in the article it refers to and that you link to, both in the abstract: Male ...
Bryan Krause's user avatar
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7 votes
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Isn't sexy son hypothesis circular?

The process is self-reinforcing but the argument is not circular (no tautology implied). As soon as some male traits are considered more sexy than others, then there is selection for females to like ...
Remi.b's user avatar
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5 votes
Accepted

How does natural selection explain sexual display?

Short answer Survival does not get your genes into the gene pool, reproduction does. thus reproduction based selective pressures can be stronger than survival based ones. there are plenty of organisms ...
John's user avatar
  • 14.7k
4 votes

Does any animal species have two sexes and more genders?

Yes, it is called Alternative Mating Strategies and is well known. As an example High-backed pygmy swordtail (a fish) are known for having two types of males, one that is large and aggressive and ...
John's user avatar
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4 votes

Does sperm weight causes sex ratio?

Probably not! There are certainly some physical reasons to doubt it. Looks like the mass difference between X and Y sperm is on the order of 0.1 picograms: X chromosome "weight"? First, ...
AJK's user avatar
  • 279
4 votes

How is "selection" best defined?

My favourite definition Selection is a fitness differential associated to a genetic variance among individuals in a population. You might want to have a look at What does fitness really mean?. What ...
Remi.b's user avatar
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4 votes

Why are (some) male humans sexually attracted to the breasts of female humans?

Short answer, we don't know. There are several competing hypotheses but they are all nearly impossible to test. Behavior often suffers the same problem as testing, we can come up with a hypothetical ...
John's user avatar
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4 votes

Isn't sexy son hypothesis circular?

Taken by itself I can agree that it might seem circular. However, in practice, all traits act and occur in a pre-existing background, i.e. in organisms with their genetic background and their living ...
fileunderwater's user avatar
3 votes
Accepted

Is mate choice in non-human primates MHC-dependent?

tl;dr It's messy for non-human primates too. Winternitz et al. (2017) ("Patterns of MHC‐dependent mate selection in humans and nonhuman primates: a meta‐analysis", Molecular Ecology 26(2)) review ...
Ben Bolker's user avatar
  • 5,364
3 votes

Do men have more extreme variations than women?

So far as we can tell any difference in variability (standard deviation) in humans is cultural not genetic and thus not consistent across the species. You are talking about something called the ...
John's user avatar
  • 14.7k
3 votes

Many black people I've met have bigger lips than white people, why?

Regard this one as a comment I prefer to cite some text form this website instead of providing the link only (as it could be removed). In general, this pattern can be observed across the planet ...
KingBoomie's user avatar
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3 votes

How can homosexuality evolve despite natural selection?

There are a lot of theories about how homosexual behavior might be maintained in a population or provide some evolutionary advantage. One thing to remember though is that there is a big difference ...
Dermot Harnett's user avatar
2 votes
Accepted

Are there any mammals in which polyspermy produces viable zygotes?

The short answer appears to be "no". The longer answer seems to be dependent on what you mean by "viable". Triploid humans do exist that apparently arise from dispermy, but most such fetuses die ...
Maximilian Press's user avatar
2 votes

Why some traits are more desirable in the sexual selection?

There are two common explanations both are difficult to demonstrate. I personally favor the former but I will not claim it is the only explanation. selection starts as either a random occurrence or ...
John's user avatar
  • 14.7k
2 votes

Is there a distinction between the fisherian runaway theory and Fisher's sexy son theory?

The Fisherian runaway is the observed phenomenon of an "arms race" of features and traits in sexual dimorphism, the Sexy sons hypothesis is the theory of why it happens. One is factual/known data and ...
Tom V.'s user avatar
  • 321
2 votes

How is "selection" best defined?

How selection is "best defined" is clearly subjective. However, even though it is a key process in evolution, the exact delimitation of (natural) selection is not clearcut, or rather, authors have ...
fileunderwater's user avatar
2 votes

Is human "sperm warfare" a concept supported by biology?

Not in humans Sperm competition is supported in humans (multiple sperm from multiple partners can be present in the same female) Specialized sperm is not supported. Specialized sperm is however ...
John's user avatar
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2 votes

Is the deep ocean fish look ugly because due to darkness there is no visual sexual selection?

I suspect the deep ocean fish look ugly to you because they are unfamiliar. The iconic fish species with which humans have coexisted forever are all surface fish, with common adaptations for surface ...
Willk's user avatar
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1 vote

Why are (some) male humans sexually attracted to the breasts of female humans?

This is a hypothesis that I found in Desmond Morris book, The naked ape. Basically, humans transit from a rear-penetration position to a frontal-penetration position. In this transition, the sexual ...
heracho's user avatar
  • 737
1 vote

Killing more attractive mates -- intersexual selection strategy?

If a guy is better looking than you and you kill him, he's obviously no longer better looking and alive -- so he can't reproduce. Animals can't go around shiving each other. This less attractive ...
swbarnes2's user avatar
  • 5,230
1 vote

Killing more attractive mates -- intersexual selection strategy?

The obvious flaw in this (as applied to humans) is that once the more attractive males discover that you are killing them off, they are likely to gang up and kill you instead. Futher details likely ...
jamesqf's user avatar
  • 3,643
1 vote

Many black people I've met have bigger lips than white people, why?

(This is an extended comment rather than an answer.) One important thing to note is that depending on where you live, the "black-ish people you've met" may not be at all representative of black ...
tparker's user avatar
  • 717
1 vote
Accepted

Why would a human female have a sexual display despite male biased operational sex ratio?

Sexual arms race. There is a fine and internally consistent theory that this strategy by females evolved to oppose the strategy of infanticide by males. Males of many species including primates ...
Willk's user avatar
  • 2,964
1 vote

Is there a kind of 'rule' which decides whether the male of female is bigger?

In short, there is not a rule of thumb whether a given species will have bigger males or females. In some cases females are larger (often insects, invertebrates or fish), in other cases males are ...
hamilthj's user avatar
  • 921
1 vote

Is there a mechanism by which mammals lose interest in a partner after mating?

Well from what I have been taught, and have studied, is that multiple partners for men does not equal more of their DNA persisting, because they are needed to provide for the offspring. So if they ...
Whitney F. Walker's user avatar
1 vote

Why are not all species hermaphrodites?

It's actually quite simple if you consider the following two points: 1.Males only have to mate with TWO MORE individuals in each reproductive cycle to outcompete a hermaphrodite. 2.mobility is ...
Rob's user avatar
  • 11
1 vote

Does any animal species have two sexes and more genders?

The white-throated sparrow has two sexes (male or female), but also has an addition "gender" (tan or stripe). So male will only mate with female. AND Tan will only mate with Stripe This behavior is ...
JayCkat's user avatar
  • 2,922
1 vote

Do male animals visually perceive females as more/less attractive?

Since asking this question, I've learned that 97% of male mammals do not have concept of "beauty" and will mate with every female indiscriminately. These species do not have any paternal investment, ...
Alex Stone's user avatar
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