@ick_real You aren't obligated since your coworker hasn’t asked,but chipping in every once in a while is a nice gesture.U could occasionally treat them to coffee.If you feel guilty about it&can afford it,you can offer&see if they’d like u to contribute,they could be too embarrassed to ask.
there's a zoo in belgium that puts otters in the orangutan enclosure for engagement and fun for both species. this has resulted in a glut of videos of otters stealing blankets from orangutans, which i've spent this morning watching at work.