All of us, we have accepted this material body. Tat sādhu manye 'sura-varya dehinām asad-grahāt, sadā samudvigna-dhiyām asad-grahāt [SB 7.5.5]. Because the living entities accepted this material body, asad-grahāt... Asat means "that will not exist." Every living entity is eternal. He must have his eternal body. But purposefully, to enjoy this material world, the living entity has accepted a material body. Not only once, but it is going on continually, one after another. As I am accumulating material desires in this life... Just like I have got this body according to my desires in the last life, similarly, whatever we are desiring in this life, that will be fulfilled in the next life. Kṛṣṇa is very kind.
As we desire, ye yathā māṁ prapadyante tāṁs tathaiva bhajāmy aham [Bg. 4.11]. Kṛṣṇa is so kind that if you want a tiger's body, Kṛṣṇa will give you. If you want a demigod's body, Kṛṣṇa will give you. If you want a body like Kṛṣṇa, Kṛṣṇa will give you. Mad-yājino 'pi yānti mām. That is stated in the Bhagavad-gītā. Yānti deva-vratā devān pitṝn yānti pitṛ-vratāḥ [Bg. 9.25]. Whatever you want, especially in this human form of life, whatever you desire, Kṛṣṇa will give you chance. It may be very unpalatable, but this is a fact. We have heard from authorities.
That is why in Vṛndāvana there are so many hogs and monkeys and dogs. This is very mysterious thing. The siddhānta, the conclusion is, we get it, information from Bhāgavatam... Just like that, the two sons of Kuvera. What is the? Maṇibandha...?
Prabhupada's lecture - Śrīmad-Bhāgavatam 1.2.17 - Vṛndāvana, October 28, 1972