I like the last painting. I see they evolved long necks to feed from taller branches on the trees.
Ah so you reject the Lamarkian theory that aliens lengthened their necks by stretching for branches (which would save them in their own lifetimes) and have embraced newer, more contemporary alien theory in which the only aliens thriving on earth are only those descendants of aliens who happened to have the necessary genetic makeup to reach higher than their peers and, after many generations have evolved into long necked species. Hmmmm....I see your point.....But, let’s say that aliens arrived right around the time crop circles and cow tipping broke out in Ireland...would that allow sufficient time for aliens to evolve through several generations....hmmm...I am going to have to look up the demographs on this species of alien to find out what their average life span is...
Robot Chicken showed what the long neck is for, and it’s not for eating leaves.