In 1946, a secret organization was funded by president Harry Truman so that creatures, who's existence was kept secret, could be studied. This secret organization would be known as Project Monarch. In March of 1954, during Monarch's study of a gigantic reptilian creature, the United States military tried to kill the creature using atomic bombs out of ignorance and fear. After that day in 1954, not many discoveries of major importance were made until the years 1973 and 1999. For the monsters in question, they were discovered after a mining accident in the Philippines when fossilized remains were discovered along with two parasitic spores, one of which had been opened. Fifteen years later, the creature had matured and made the world aware that monsters exist. These creatures were known simply as Massive Unidentified Terrestrial Organisms or MUTO's for short.
As mentioned above, these prehistoric parasites were first discovered after a mining accident in 1999 in the Philippines in the form of spores attached to the fossilized remains of what appeared to be a member of Godzilla's species. One of the spores was open, showing that the creature was not only alive, but hunting for food. It was this creature that caused the meltdown of the nuclear plant in Janjira Japan, cocooning there for fifteen years until it had matured and took flight. It went looking for new food sources and calling out to something. Its actions had gotten the attention of an alpha predator that hunted this thing all across the Pacific and later engaged said predator, dubbed Gojira. After studying its actions and vocal patterns, it was discovered that the second spore, which was taken to Yucca Mountain in Nevada, had opened and the new MUTO, revealed to be a female, was on the move to San Francisco, where she would meet the male and they would reproduce. In order to stop them, a plan was made that since these creatures feed on radiation, a nuclear warhead would be taken out to sea, luring the MUTO's and the MUTO's luring Godzilla, killing them with the force of the blast. Once Godzilla had made landfall in San Francisco, the warhead was activated only for the male to take it and give it to his mate, putting thousands at risk. While Godzilla battled the MUTO's, a strike team would go in and disarm the warhead but they failed, leaving Godzilla to kill his enemies, impaling one against a building and decapitating the other.
These are some really creative monsters with an interesting yet tragic story. They are also the only monsters that I know of that have an extreme sexual dimorphism; I am aware that the Gappa's have sexual dimorphism but the only differences for them are their horns. Let's start with the male of the species. The male MUTO or Hokmuto was the first to break out of its spore, burrowing to Janjira Japan as it was the closest source of radiation for it to feed on. It stands at around 60 meters tall and has six limbs, two of which are wings, allowing it to fly over vast distances or outmaneuver enemies, latching onto them with hooked appendages. Because of it's body shape resembling that of a stealth fighter jet, this creature is not only fast, but it can also dive underwater to drag prey out such as when it dove to catch a Russian nuclear submarine and drag it several miles inland on the island of Hawaii and when it dive-bombed a military ship to take a nuclear warhead.
The female or Femuto stands at a height of 90 meters and is much more bulky than the male. She is also much stronger and able to tank attacks that could kill the male. Also, like any mother, she is very defensive of her offspring such as when she engaged Godzilla shortly after laying her eggs.
As prehistoric parasites, the MUTO's abilities are almost basic for animals. They can communicate over long distances via echolocation which is how they found each other in San Francisco. The male, as previously stated, can fly and swim to an extent, both have heavily armored skin but their most interesting ability is that they can convert the radiation they've consumed to produce EMP. Now you may be thinking, "EMP fries anything electric, how did that help them in prehistoric times?" That question can be answered as such: It is a defensive mechanism to short out Godzilla's most iconic ability, rendering it almost useless. The male could trigger it by charging its front claws and either slamming them against the ground or triggering it in the air while the female's EMP was given off in a "sphere of influence." After the female was killed, the power in San Francisco came back on, indicating that whenever the female was around, everything shut off.
Like with Sanda and Gaira, the MUTO's are monsters that cannot have a happy ending. If they had their way, the world would have been destroyed and overrun. They could not have a happy ending simply because they are monsters, The tragedy of monsters is that they are born too tall, too strong and too heavy. Be that as it may, if your power suddenly shuts off, followed by an unnatural low roar, run for your life and do not look back. The only one to take these creatures on is one that can restore balance. Rule of thumb is to let nature sort itself out without interfering. If monsters meet each other, LET THEM FIGHT!!!