Pets in the classroom can be a great idea, but having had a variety of animals in and out of the classroom (sheep, rabbits, goats, fish, lizards, aquatic frogs), let me offer some logistics to consider. Some, I know are repeats. Please treat this as a living document and add to it!
Rules and regulations of your school / district
Alllergies of all involved: students, teachers, staff, families that might come in contact
Special habitat requirements: do they need heat 24/ 7, filters runnings, etc
Habitat maintenance: how often does the cleaning need to be done, and who is going to do it
Cost: who pays for the feed, habitat materials (bedding, replacement filters, etc). What about required shots and vet bills? Vet emergencies?
Breaks: who is either coming in to take care or who is taking the animals home. And how will the animal(s) be transported?
Closely related: imclement weather policies: if you have, let's say, rabbits outside, what do you do during extreme tempratures / bad air quality days?
Where is the animal going to go? What do you need to move / eliminate from your classroom to make room for the animal and all its belongings
I know that my tiny little classroom with a big window opted for 'adopting" the birds outside, putting up feeders, choosing plants birds we onserved liked, and essentially doing everything that we would do with a non-touchable pet indoors, with a lot less hassle
Hope this helps
(and yes, I just copied my posed from animals in the classroom; the two topics seemed very related) Happy Friday :) !