To sign "alligator," open and close "curved-five-handshapes" to represent the
mouth and teeth of an alligator as it catches its next meal.
ALLIGATOR:



CROCODILE:



"What!?" you say, "Those two signs look exactly alike!" (Except perhaps for
the fact that I'm hamming it up in the first version and I'm more straight
faced in the second version.) Well you are right, they ARE the same
sign.
Most of us do the same sign for both alligator and crocodile.
Okay, okay, so what could you do if you needed a separate sign for
"crocodile?"
What are you? A zoologist?
Suppose you were telling a children's story about an alligator
and a crocodile? You could modify the existing Alligator sign a bit to
show a real life difference. Crocodiles have snouts that are more narrow
than that of alligators. So you could change your handshape to be more
narrow:
CROCODILE (Modified version, for special circumstances.)



By the way, the sign above is the actual sign for crocodile as used in Argentina.
Someday you might see the Signed English version of "crocodile."
That version uses "C" handshapes to emphasize that you are referring to a
crocodile and not an alligator. I do not recommend using that version.
It is not ASL.

You can learn American
Sign
Language (ASL) online at American Sign Language University ™
ASL resources
by Lifeprint.com © Dr. William Vicars