In the column to the left of the creature type name, the percentage of the strength of 1 of that creature is indicated, relative to 1 dragon. In the column to the right, the strength of the full growth rate is indicated, as a percentage of 1 dragon.
A growth rate of x2 means that the actual full growth rate is equal to double, but when building the basic dwelling, only the simple (non-doubled) growth rate is applied. The subsequent weekly growth rate of such dwellings (if a Fortress is present) is equal to the full (doubled) growth rate. When building upgrades, the new creatures that appear are also equal to the full (doubled) growth rate.
+: creature growth is supported by the Castle (+X/+X arrival/growth rate).
++: creature growth is supported by the Stronghold and Castle (+X/+X for each)
!: there is an extension (+Y growth rate)
where X is the basic growth rate, and Y is the full growth rate.
Thus, the actual growth rate of creatures, taking into account fortifications and extensions, can exceed the full growth rate.