Invasion of 'Red Admiral' Butterflies

I named this post 'Invasion of Red Admiral butterflies' because they are everywhere in my garden. I don't know why but I've read it happened due to the hot summer this year. Here is what I learned about 'Red Admiral' (Vanessa atalanta):
"The wingspan can reach 76 mm. These butterflies are found from the tundra areas to the subtropics. Females lay one egg each on nettle leaves, which serves as a food for hatched caterpillars. Before turning into a chrysalis, they fold the nettle leaf into a "bag" and entangle it with a silk thread. Unlike many other butterflies, red admirals prefer gum from trees and the juice of rotting fruit to nectar". (wiki)

Butterfly invasion continues for several days. They are everywhere: 
on a Physocarpus opulifolius bush, 
on a drainpipe, 
on a water barrel, 
on a greenhouse, 
on an old towel, 
on a Elaeagnus argentea bush, etc. 
I've taken macros to see a head and a body of Red Admiral. Watching close I guess it looks like an alien.

Here is a vase with Callistephus and Cineraria leaves: