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2. A third wasp arrives
Another female lands and shows interest.
3. Still stuck, the entrance blocked
The second female was not content to watch from the sidelines.
4. She climbs on top
The second female climbs atop the ‘stuck’ pair, exploring the burrow edge with her antennae.
5. Not quite in copula
The male is gripping the first female, but they are not coupled … his terminal abdominal segment is well clear of hers.