The Monarch Butterfly (Danaus plexippus) has a serious problem where I live in Tenerife. Its caterpillars can only eat Scarlet Milkweed (Asclepias currasavica), which is grown in some parks and gardens (not enough!), or Swan Plant (Gomphocarpus fruticosus), a recent introduction but not found growing in the wild just like the other food-plant of the Monarch. The female butterflies have hundreds of eggs to lay and are compelled to seek out the correct plants on which to deposit them. This they have to do. It is their role in life! The Milkweed and Swan Plant are not grown in many gardens and there are no wild species the butterfly can use. This means that although in a natural habitat there should be enough food for each caterpillar, and each female should lay only one or two eggs per plant, they do not have this opportunity with a severe scarcity of food-plants. If a mother Monarch finds a plant she will return over and over again to place her eggs on it.
Without human intervention a disaster will occur because when the baby caterpillars hatch there will ultimately not be anywhere like enough food to support them all and after all the leaves are gone they will all die.
I have tried to help the situation but it is so very difficult. When a female Monarch turns up and lays her eggs on the small number of plants I have on my balcony I know there are far too many. I am forced to turn her away by catching her and moving her. I am forced to play God and instigate some sort of cull by crushing many of the eggs.
I hate doing this so much! I am forced to become a murderer to try and save some lives! When the babies hatch it is even harder. Each one could be a beautiful Monarch butterfly that would one day soar through the skies but it is obvious that most will never reach that stage. Most will die horribly of starvation!




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