In no particular order:

!birding@lemmy.world

!blurrypicuresofcats@lemmy.world

!dogs@lemmy.world

!foxes@lemmy.world

!guineapigs@lemmy.world

!herpetology@mander.xyz

!manul@lemmy.blahaj.zone

!otters@lemmy.world

!raccoons@lemmy.world

!snakes@lemmy.world

Some less active honorable mentions:

!animalswithjobs@lemmy.world

!beavers@lemmy.world

!oneorangebraincell@lemmy.world

!squirrels@lemmy.ca

A few I’d like to see get more active:

!animalsbeingderps@lemmy.world

!redpandas@lemmy.world

I’m sure I’m missing a ton of them, so please comment with the missing ones, I’ll edit the post at the end of the day so that we can reuse it next week

• !beebutts@lemmy.world
• !bun_alert_system@lemmy.sdf.org
• !cat@lemmy.world
• !cats@sh.itjust.works
• !bats@lemmy.world
• !aww@lemmy.world
• !aww@lemmy.ml

I think !lemmybewholesome@lemmy.world isn’t very animal focused.

Definitely have to add one of my favourites:

!opossums@lemmy.world

!crows@lemmy.ml remains fairly active.

!foxnews@lemmy.sdf.org needs more action but the name for a community about foxes is great

!catposting@lemmy.blahaj.zone

!scrungycats@lemmy.world

Slightly different focus than just cute animals but !conservation@slrpnk.net could fit the bill.