he was not foaming at the mouth, no spitting of saliva. Just standing upright bobbing side to side (losing balance?) with the mouth open.

What does it mean IF he was to spit up saliva?
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1.0 Werner's Three-Horned Chameleon (Chamaeleo Trioceros werneri)
1.1 Eastern Tiger Salamanders (Ambystoma tigrinum)
0.0.3 Mexican Red-Knee Tarantulas (Brachypelma smithi)