Fossil identification

[Huntwi]

Hi everyone I’m very new to this and recently got two fossils that I’m hoping some of you may be able to help recognize. The first is a black bone found I believe in the ocean off Florida. I was told it was a deer humerus but looking at a modern deer humerus I’m not so sure. Could be deer just different bone? 
 

The other was one is the lower jaw bones of what I was told may be from a rabbit or rodent. Looking in a fossil book I’m thinking it’s possibly a beaver based on teeth. Old but not a fossil I’m thinking since it’s not stone? 
 

Regardless of what they are I think they’re pretty great so any help would be appreciated! Thanks!

[jpc]

whoever told you it was a humerus, best not to ask them to ID a bone next time.  This is a rib head.

The jaws are rodent, not rabbit.  

[Huntwi]

JPC I appreciate the ID I think you’re spot on it that the dark one is a rib head from further back on the deer. I think you’re right on the lower jaws being rodent and not rabbit too. Comparing molar and jaw line images I’m thinking it’s a beaver (largest North American rodent). Thanks again!!

[jpc]

three inches... beaver is a good guess.  To really ID rodents, you need to compare the patterns on the chewing surfaces of the teeth.  

[Harry Pristis]

For comparison:

 

[Huntwi]

Yes that’s what the patterns on the teeth look like. In an identification book it also talked about that sharp bone protrusion in the chin area and the orange front different colored back of the front teeth. When I got it I never would have guessed a beaver because it’s so small.