On every fb post, or suchlike: when there's a cute little wild critter, be it a bird, a small furry animal, a seal, etc.. It's ALWAYS assumed to be male even when the sex (I'm assuming animals aren't bothered by the nuances of gendered self-identification) isn't apparent. It annoys me so much. It's as if the whole female biological pantheon of variation just doesn't exist...
Look at the language: 'cute little fella' 'bad boy' (once used by Jamie Oliver to describe a cooked prawn ffs!) 'little chap' etc etc.
Once you see it you can't unsee it.
...Drives me crazy.