KP+55-300mm PLM at 300mm, cropped.
Side-blotched lizard (orange throated morph, probably ultra-dominant male) by
k kwb, on Flickr
Until recently I had no idea that these lizards have three distinct male morphs and two female morphs.
Common side-blotched lizard - Wikipedia
This orange-throated one is probably ultra-dominant male with a big territory and many females to defend. Blue-throated ones are smaller in size and have smaller, one-female territory to defend. Yellow-throated ones are the smallest, don't have any territory and look similar to mature females.
Due to their appearance, yellows don't have much difficulty sneaking into orange's territory to "steal" unattended females. Oranges can steal mates from blues by physical strength. Since each blue has only one mate to defend, yellows stand no chance against blues. It's like rock paper and scissors.
As a result, when the orange population is the largest, yellows tend to leave the largest number of offspring. When the yellows become the dominant population, due to smaller number of aggressive oranges, blues tend to rise in the next year. But when blues are the largest in number, due to smaller number of sneak-in attempts by yellows, oranges will flourish.