Age of the birds (evolution, wildlife, survive, wild)

[Nothere1]

Going off of science, I think every animal in the future will get smaller, while birds get larger. I was once told one the reasons for the dinosaurs enormous size was that the atmosphere was a lot less dense in the Mesozoic era. With the recent burning of fossil fuels, we are adding more pressure to the atmosphere. With that information in mind all animals will continue to get smaller. On the other hand, I imagine it would be easier for birds to use lift. Therefore, by the way of evolution, the birds would either have to get stronger and/or grow larger wings to compensate. In the event we don't kill all wildlife in the future, and it was to normally progress. I imagine that the next 'changing of the guards', like when the reptiles replaces amphibians, birds will have the upper hand. Thoughts?

[grega94]

I think in general all animals will grow smaller, or all the large ones will die off, since humans have a tendency to kill the largest animals. It can already be seen deers where the antler sizes have been decreasing since deers with the largest antlers get killed first by hunters. Also wildlife territory is shrinking so large animals won't have enough land to thrive unless they are able to share it in a developed landscape. The only animals to survive will be those that are small enough to hide, or those that reproduce at high rates. Generally large animals can't do either. So I don't really think that increasing air pressure will make animals smaller, but our hunting habits and shrinking/changing habitats might. One thing that global warming can do is that smaller animals tend to be more adaptable where are as megafauna are much more niche based, so the increased stress on habitats might kill off megafauna at a higher rate than smaller animals. Also birds have been evolving smaller wings to avoid cars.

https://www.newscientist.com/article...vive-on-roads/