Kind of a weird question IMO. I don't even think animal lives are worth the same as animal lives. Is a single deer's life the same as a single ant's life?
I consider myself to be kind and thoughtful towards people and animals -- I'll save snails or worms that I find while gardening, but I also will kill mosquitos that are inside my house, and move spiders outside where they will potentially die.
This isn't even getting into "special" animals like pets
Yeah, I'd like to see the results from the question : I have a gun pointed at your long time childhood friend and one pointed at this cow, now is this cow's life worth the same as your friends life?
A better comparison would be if the human in question was a random dude you pulled off the streets. If this was a cow that I grew up with and shared a bond with, then yeah, I'd obviously pick the cow over some dude I don't know. If it's a childhood friend versus a random cow I don't know? Same thing but in reverse.
I have a gun pointed at your dog and another pointed at a guy that's going around eating people's pets...
You are mixing the rational component of the question in general with the emotional attachments of particular situations. This kind of "I know it in my heart" drive is the same that drives things like racism and xenophobia.
Interesting (or, perhaps, expected) that the more progressive/left leaning demographics correlate with a higher proportion valuing human and animal life equally. Sort of makes sense and I'm glad to see it.