The spikes pertruding from their backside are called cornicles. When threatened they help disperse a defensive liquid, which is pushed through and secreted from the end of tip.

These garden pest get about a few millimeter in size, with colonies made up of varying stages along their life cycle; ranging from nymphs to adults.

Oleander aphids: Aphis nerii

ISO400 55mm 0ev f/5.6 @ 1/2500s
Taken with Canon T2i Rebel equip with 18mm - 55mm and Macro FX Lens Full.

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