I have a ambilobe male aprox. 2 years old, he was with a female a little less then year ago, and then again with a different female 6 months ago , all went well. I recently put another female near him, she was receptive, he went after her with great agression trying to bite her,no head bobbing like the two times before . I have since tried him with 2 other females near his cage and also in neutral territory, a very large umbrella tree with the same results, although he did seemed less agressive on the large plant. any ideas ?