They are not spikes - they are arms. They use these 'arms' to catch other cells to mutate them or eat them.
Because HIV is a virus. Viruses have spikes because it is their way of reproducing.
Most of the time if an animal has spikes, they are there to protect them from predictors.
porcupine
Spikes are proteins that are part of the viral capsid/envelope (depending on if the virus is a naked virus or not). It helps with attachment to the host cell. They are derived from their host cell's own proteins (but are not the same as their hosts), and can help in evading the host cell's defenses.
I am not an animal
The function of spike proteins is to imitate a protein your cells take in to allow the virus access to the nucleus.
Leaf sheath and spikes
animal jam is not a virus
Hedgehog or porcupine.
Hedgehogs, primarily.
hedgehogs
spikes big yellow teeth shrp claws