Oil Beetle (Meloe proscarabaeus)
Seeing this creature climbing up the garage wall sent me running for the camera and the field guide. I had seen Oil Beetles before but normally on the Purbeck coastal cliffs; I did not expect one in our garden. What I discovered was, frankly, amazing!
It seems that in spring the female Oil Beetle lays an enormous amount of eggs in soil, several thousand per batch and several batches per individual.
The eggs soon hatch in to wriggling larvae with strong jaws and claws. They climb up on to the heads of Dandelions and await the arrival of their host insects.
When an insect comes along to feed on the Dandelion the larvae attaches itself but only a very few actually attach to the right host, a species of solitary bee! Those that make the wrong choice perish while the lucky ones cling on and are transported back to the bee's nest.
Once there, it eats ONE egg! After that it turns its attention to eating the bee's food.reserves, nectar and pollen. After several moults the larvae turns in to a grub, pupates and emerges as an adult in spring ready to mate and start the complex cycle again.
Now is that amazing or not?