Tyrannosaurus Rex mates

[DarkHououmon]

Inspired by a brief discussion with Noname. The image depicts a male T-Rex (the more brightly colored one) with his mate (the brown one).

The method that scientists used to determine that female T-Rexes were larger was in error. So it is possible that it was the males who were larger.

http://i165.photobucket.com/albums/u72/Inf...n/TRexmates.jpg

[Noname]

Good picture. Yes, while I cannot 100% prove that males were larger, evidence from closely related animals, plus the fact that the default on land (among creatures with a backbone) says that is is true that the male is larger. Anything which defies this trend is called reverse sexual dimorphism (present in a few species), indicating that the normal form for the majority is for the male to be larger.

[rosie]

Cool picture.

[Kor]

Nice picture indeed.

[DarkHououmon]

Thanks for the compliments. ^^

Yes, while I cannot 100% prove that males were larger, evidence from closely related animals, plus the fact that the default on land (among creatures with a backbone) says that is is true that the male is larger. Anything which defies this trend is called reverse sexual dimorphism (present in a few species), indicating that the normal form for the majority is for the male to be larger.

I haven't really heard anything on male being bigger is the default. I did read up on Sexual Dimorphism, and so far, only one place has said that in most cases males are larger. In one source, it says most of the time females are larger.

In nearly all animal groups (apart from mammals and birds), females are larger than males because larger females tend to produce more eggs and contribute more young to the next generation.

Taken from: http://www.answers.com/topic/sexual-dimorphism

And in another it doesn't really indicate which is the most common.

In many species, including most mammals, the male is larger than the female.[1] In others, such as most insects, spiders, birds, reptiles and amphibians, many fish, and certain mammals such as the spotted hyena, the female is larger than the male.

Taken from: http://en.wikipedia.org/wiki/Sexual_dimorphism

[Noname]

Most species are insects or other invertebrates. I'm not talking about ALL animals, just terrestrial vertebrates; yes, female ants and bees may be larger, but not female crocodiles, lions, horses, apes, or elephants (and so on...)

[DarkHououmon]

Most species are insects or other invertebrates. I'm not talking about ALL animals, just terrestrial vertebrates; yes, female ants and bees may be larger, but not female crocodiles, lions, horses, apes, or elephants (and so on...)

Oh terrestial vertebrates. Whoops. Must have overlooked that. Sorry.