That looks like a spur. Is it hard like a nail is?
large protruding growth on chicken (ankle?)
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That is truly interesting, at least from a social perspective, imo! I assumed that was what was meant by changing, but hey- crabs can and do ACTUALLY change sex so I had to ask. 
And to follow up on it before Robin asks-- we are still figuring this part of changing sexes out in the crabbing world. It is really hard to keep track of who is who when they're swapping shells, going under the sand, and changing their 'look' each time they molt. So, we know it happens. It has been proven using big pincer setae patterns to ID the crabs. (Those do not change; setae are the hairlike structures on their legs, they leave basically a bump on the shell always in same unique patterns, like a fingerprint kind of.) We just don't know how often or what exact conditions prompt the change yet.
And to follow up on it before Robin asks-
- we are still figuring this part of changing sexes out in the crabbing world. It is really hard to keep track of who is who when they're swapping shells, going under the sand, and changing their 'look' each time they molt. So, we know it happens. It has been proven using big pincer setae patterns to ID the crabs. (Those do not change; setae are the hairlike structures on their legs, they leave basically a bump on the shell always in same unique patterns, like a fingerprint kind of.) We just don't know how often or what exact conditions prompt the change yet.
Can't help it, I'm naturally curious about a lot of things.That is truly interesting, at least from a social perspective, imo! I assumed that was what was meant by changing, but hey- crabs can and do ACTUALLY change sex so I had to ask.
And to follow up on it before Robin asks-
Girl, it is clear I am just the same! I just couldn't resist.
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