Thanks for your reply, Dr Britton
Sorry if I didn't explain myself properly. The spur legged's were all adults and eating voraciously until the introduction of the children's nymphs. Then, within two days, every one of the spur legged's was dead and the nymphs continued to thrive. It just struck us as being very odd.
Hi Dr Britton,
My partner was given some stick insect eggs which hatched into Spur Legged stick insects. He also found a Children's stick insect female outside which he took care of and she subsequently laid eggs too. They have all hatched (the Spur Legged insects are all 2nd generation clones from unfertilized eggs). He placed the Children's stick insects nymphs in a large enclosure with the Spur legged insects and within a day or two of the Childrens final molt, all the Spur legged insects had died. The Children's insects are thriving so we ruled out pesticide contamination of their leaves. Do you know why this might have occurred? Thanks in advance