Spotted this bee this morning in the garden. It seemed a little confused and then crawled onto the underside of a leaf. Then something started to come out of its back end.
It has been parasitised by another insect. Some insects have a sharp ovipositor which enables them to lay eggs inside another living creature. When the eggs hatch, the larvae feed on the unfortunate host's insides and then emerge, which is what you saw happening. It is usually fatal for the host. Well done for being on the spot with a camera, they are extraordinary photographs.
First, it is not a bee, it is a hoverfly, but I cannot tell which species. What you see is merely the male genitalia - see page 150 here for similar examples.
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What you see is merely the male genitalia - see page 150 here for similar examples.
https://www.zoologicalbulletin.de/BzB_Volumes/Volume_66_2/145_165_BzB66_2_Steenis_et_al.pdf
Not the best pictures as it was upside down and i didnt want to disturb it.
I didnt think hoverflies were this big.
https://nearbywild.org.uk/quick-guides-▾/bee-bee-fly-or-hoverfly/
Gardening in Central Norfolk on improved gritty moraine over chalk ... free-draining.