weird death

i went to lead a chicken to a box to harvest it for eggs and it died during daylight but there was no blocks for it to suffocate in and i got confused cause there was no hostile mobs so basically the mob just died in the air it was walking fine for a few seconds and it took damage when nothing harmed it. the other would be animals making noises but not showing up on my screen and i re logged and they were their again. these are glitches i have found so far.