geckos are more rare than cows.
Normal types wouldn't be. but leopard geckos come in different morphs, or colors. Nicer and rarer colors will cost much more. A normal looking gecko can cost $25, while a rarer coloration could cost $3000.
Insects bigger than pygmy geckos.
you seem to have an infestation of geckos!
This is some reasons a leopard geckos and Madagascar day geckos can't live together: #1: Madagascars have a different environment than leopard geckos. Madagascar day geckos live in tropical conditions and leopard geckos live in desert conditions. #2 they would be fighting because they are territorial.
The cow is larger than a cow brain.
yes. but are much rarer
Melanism is rarer than Albinism
Blue diamonds are speculated to be rarer than white/clear diamonds because it is more difficult to form naturally. Blue diamonds, as such, are worth more than regular white diamonds
No their is no colour difference.
I personally think a mouse is cuter than a cow.
I would think that a cow is faster than an elephant.
Yes, platinum is rarer than gold.