Dola's

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Does any of you feed dola's, the larvae of rose beetles, to it's newts/salamanders? I'm thinking about using them as supplementary food, but I don't know if they're aggressive or anything like that.

Is anyone familiar with the nutritional value of these larvae?

 

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Update: I'm using them as a regular treat for my bigger salamanders, they seem to be very good in nutritional values and are the favourite food source for my animals. As soon as they are put in their tank they're being chased fanatically.

The only difficulty with dola's is that they flee very quickly into the soil.