The meaning of life is to continue to live.
One thing that every species shares with one another is the instinct for self-preservation. Ants will try to avoid being squished in the same way that a human will try to avoid a car crash.
This is really the only property that is ubiquitous throughout all life forms as we know it. Survival.
Beyond that, I think you may as well create your own meaning.
I agree with you mostly....
But animals do kill themselves.
There have been many reports of dogs killing themselves...some seem to drown themselves...while some, after the death of their owner, simply refuse to eat and in turn die. Ironically enough, ducks have also been reported to have drown themselves. Of course we all know that whales beach themselves (but whether this is an extreme act of sadness or something wrong with the Earth’s magnetics, food supply, etc....no one knows).
In 2009 cows and bulls mysteriously threw themselves off an alpine cliff over a period of three days.
Deers will leep to their death off cliffs in order to avoid capture by hunting dogs.
In Turkey, 2005, 1,500 sheep calmly walked off a cliff.
Insects will kill themselves in self-defense...the pea aphid will explode itself in an attempt to kill the ladybug attacking, protecting the other aphids...ants, termites, bees, wasps, all commit similar acts.
There is even a parasite that will direct it’s host toward predators so it will be eaten. There is a parasitic worm that causes grasshoppers to leap into the water so the worm can reproduce. Infection with
T. gondii has been shown to alter the behavior of mice and rats in ways thought to increase the rodents’ chances of being preyed upon by cats.
The biggest animal suicide misconception was the Disney film “White Wilderness” which showed lemmings leaping over a cliff while the narrator says “One by one....they throw themselves bodily over the cliff....” come to find out later, the crew of the film threw them over....lol.
Interestingly enough, suicidal behavior has been observed more in female animals than male and in more vertebrates than invertebrates.