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[spilota_variegata]

I have a pair of yearling womas that both display the same behaviour and I was wondering if all womas do this. They are both eating like pigs and are healthy but everytime I approach them in their enclosures they puff themselves up, flatten their heads and hiss at me. They are very cute and have never bitten. When I have them in my hands, they become pussies. I thought it was because they were small when I first got them but they're a fair size now and still do it.

Any thoughts??