Re: "Is there any evidence that electromagnetic fields can affect the behaviour of animals?"
If you squint at the correct quantisation magnetic fields are mediated by virtual photons. It's also a magnet spinning at a bit under 12 microhertz, so technically radiating EM at that frequency.
And generally in relativity, whether fields are magnetic or electric depends on how you're moving relative to them. Both fields can be written in relation to a four-vector potential.