I unironically take “printscreens” with Lens (basically “scan”) from monitors of offline or limited connectivity computers.

My pet peeves are cropping-by-Snipping-tool snapshots of photos, which take huge space as PNGs in picture-heavy documents.

Sounds like wolf spiders. They are actually good mammas and they haul their 'lings on their backs until they are old enough to disperse.

Oxygen levels wouldn’t be a factor. The “need high oxygen levels for large size” only applies to invertebrates with very simple breathing systems.

If trex had similar type of lungs as modern birds, they would do just fine. Bird lungs are super efficient (much better than mammals’ puny blind sack lungs) that enable them to fly at high altitudes.