@DH: Really; I was sure it was the other way around!
1 means that it takes the absolute value of the latitude before it checks if it is within the latitude range defined.
So:
<bLatitudeAbs>1</bLatitudeAbs>
<iMinLatitude>10</iMinLatitude>
<iMaxLatitude>30</iMaxLatitude>
means that the animal can spawn in -10 → -30 & 10 → 30 latitudes.
@Harrier: the tag defaults to 1 if removed.
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This:
<bLatitudeAbs>0</bLatitudeAbs>
<iMinLatitude>-25</iMinLatitude>
<iMaxLatitude>25</iMaxLatitude>
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equals:
<iMaxLatitude>25</iMaxLatitude>
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Toffer90 - you are correct. <bLatitudeAbs>0</bLatitudeAbs> is the setting I needed to make them only spawn on the settings I gave. Thanks.