This is straight out of 2nd Ed's Complete Ranger, not entirely sure it's legal just copying it word for word, but hey, it's an old book
:
Identification Check
By noticing details that other characters might overlook--the depth of a footprint, the
thickness of a snapped branch, a hair caught in barbed bush--the ranger can deduce a sizeable amount of information about his quarry. The more skilled the ranger, the more information he deduces.
Whenever a ranger makes a successful Tracking check, he may then attempt an
Identification check. The Identification check uses the same score and modifiers as the Tracking check; essentially, the Identification check is a second Tracking check.
If the Identification check is successful, the DM provides the ranger with some information
about the quarry based on the guidelines in Table 19. The ranger's experience level determines the type of information he receives. The information is cumulative; that is, a 6th-level ranger who makes a successful Identification check receives all types of information available to rangers of level 6 and below.
The DM provides only general information, not exact details. At his discretion, the DM may
give more precise or less specific information than suggested in Table 19. The information may be ambiguous ("The tracks resemble those of a large bird, though they could have been made by some sort of reptilian creature.") but the DM shouldn't intentionally mislead the ranger (for instance, by telling him the tracks were definitely made by a bird when in fact they were made by a reptile). The parenthetical comments in Table 19 indicate how a DM might respond to a ranger studying tracks that were made by a pair of juvenile red dragons, each with a human rider.
Table 19: Identification Check Results
Ranger
Level Information Received
1-2. General type of creature
("A dragon or other large reptilian creature.")
3-4. Specific type of creature and where it was heading
("Some kind of dragon, probably red. It appears to have been headed to the
mountains to the north.")
5-6. Probable number of creatures
("Looks like two of them.")
7. Approximate size and/or age
("From the length of the prints, the dragons were probably juveniles.")
8. Pace of creatures
("There's no indication of haste; they were probably taking their time.")
9. How recently the trail was made
("The tracks were made within the last three or four hours.")
10+. Special conditions of creatures: wounded or healthy, mounts, etc.
("The unusual depth of the prints and the space between steps indicates the
dragons had riders. A tiny scrap of cloth is similar to the material worn by
soldiers in this area. The riders were probably human.")
Some tweaking would probably have to be done, because of the difference between 2nd ed and 3.5.
