The total number of beasts that can be known is determined by the character's knowledge points and measure of expertise.
These are "studied beasts," the accumulated list of creatures the character has knowledge about.
The total number of items on the list will be 1 item per 2 points of knowledge above 8. Thus, a character with 18 points of knowledge would have useful knowledge of 5 unusual beasts.
The character will possess knowledge of the beast's probable present location, along with a general history of the beast, it's place of origin, nature and myths associated with its appearance. The beast's basic strength (comparable to ordinary beasts of its form) will be known. As with all beasts, the character will also understand the beast's form and power, depending upon the character's knowledge.
Which unusual beasts are randomly chosen from parts of this list.