it is not such a stretch. according to Oxford dictionary, to throw is :
1.propel (something) with force through the air by a movement of the arm and hand.
which is a very human concept. We then can not judge other species ability to do it (exept primates). just like we can not say animals don't have languages because thay don't speak english.
2.send suddenly into a particular state or condition.
The archer fish is then very efficient at sending water into a particular state or condition with high accuracy.
the octopus for exemple has been observed throwing stuff around.
edit : elephants do it to. and you can find plenty of bird examples.
yeah, it's more about finding open minded people with empathy (and be open minded and empathic ourself) more than finding people just like us. Embracing differences, respecting and understanding eachother is key. There are plenty of people out there who keep their kids to themself and have plenty of other interests, it's easier to meet them if we don't push them away in the first place (just like they don't push us way fro being child free).