Back in the 1990s, Ultron decided he should look beyond his "Kill all humans" philosophy.

Ultron may be a genocidal murder-bot, but he thinks ahead. "Plants and animals might someday evolve to be a threat to me. Better kill them all, too."
Three pages from WEST COAST AVENGERS #90 after the cut. Written by Roy and Dannette Thomas with art by David Ross.
( Ultron collects himself )